Boiling eggs on machine, why more water for fewer eggs?

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15
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I got an egg boiler machine, on the instructions is stated:




Less water is used when cooking more eggs.




My thermodynamics understanding cannot figure this out yet. Why would I need less water for more eggs?



The machine beeps when the water has evaporated, so the eggs are ready. In that case, why will less water cook more eggs?










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  • 4




    There is an answer on Quora. Maybe it helps.
    – EuklidAlexandria
    12 hours ago







  • 1




    Eggs displace water. If you filled the thing with no eggs and all water, then added eggs, the water would overflow. More eggs, more overflowing - less water left.
    – J...
    2 hours ago










  • @J...The eggs are not touching the water.
    – Taemyr
    42 mins ago










  • @Taemyr they do in the egg boiler I have. If they don't touch the water then it's a steamer rather than a boiler, I suppose?
    – Aaron F
    11 mins ago














up vote
15
down vote

favorite












I got an egg boiler machine, on the instructions is stated:




Less water is used when cooking more eggs.




My thermodynamics understanding cannot figure this out yet. Why would I need less water for more eggs?



The machine beeps when the water has evaporated, so the eggs are ready. In that case, why will less water cook more eggs?










share|cite|improve this question









New contributor




MaKo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.















  • 4




    There is an answer on Quora. Maybe it helps.
    – EuklidAlexandria
    12 hours ago







  • 1




    Eggs displace water. If you filled the thing with no eggs and all water, then added eggs, the water would overflow. More eggs, more overflowing - less water left.
    – J...
    2 hours ago










  • @J...The eggs are not touching the water.
    – Taemyr
    42 mins ago










  • @Taemyr they do in the egg boiler I have. If they don't touch the water then it's a steamer rather than a boiler, I suppose?
    – Aaron F
    11 mins ago












up vote
15
down vote

favorite









up vote
15
down vote

favorite











I got an egg boiler machine, on the instructions is stated:




Less water is used when cooking more eggs.




My thermodynamics understanding cannot figure this out yet. Why would I need less water for more eggs?



The machine beeps when the water has evaporated, so the eggs are ready. In that case, why will less water cook more eggs?










share|cite|improve this question









New contributor




MaKo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











I got an egg boiler machine, on the instructions is stated:




Less water is used when cooking more eggs.




My thermodynamics understanding cannot figure this out yet. Why would I need less water for more eggs?



The machine beeps when the water has evaporated, so the eggs are ready. In that case, why will less water cook more eggs?







thermodynamics everyday-life






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MaKo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|cite|improve this question









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edited 15 mins ago









Emilio Pisanty

75.5k18180371




75.5k18180371






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asked 12 hours ago









MaKo

1786




1786




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  • 4




    There is an answer on Quora. Maybe it helps.
    – EuklidAlexandria
    12 hours ago







  • 1




    Eggs displace water. If you filled the thing with no eggs and all water, then added eggs, the water would overflow. More eggs, more overflowing - less water left.
    – J...
    2 hours ago










  • @J...The eggs are not touching the water.
    – Taemyr
    42 mins ago










  • @Taemyr they do in the egg boiler I have. If they don't touch the water then it's a steamer rather than a boiler, I suppose?
    – Aaron F
    11 mins ago












  • 4




    There is an answer on Quora. Maybe it helps.
    – EuklidAlexandria
    12 hours ago







  • 1




    Eggs displace water. If you filled the thing with no eggs and all water, then added eggs, the water would overflow. More eggs, more overflowing - less water left.
    – J...
    2 hours ago










  • @J...The eggs are not touching the water.
    – Taemyr
    42 mins ago










  • @Taemyr they do in the egg boiler I have. If they don't touch the water then it's a steamer rather than a boiler, I suppose?
    – Aaron F
    11 mins ago







4




4




There is an answer on Quora. Maybe it helps.
– EuklidAlexandria
12 hours ago





There is an answer on Quora. Maybe it helps.
– EuklidAlexandria
12 hours ago





1




1




Eggs displace water. If you filled the thing with no eggs and all water, then added eggs, the water would overflow. More eggs, more overflowing - less water left.
– J...
2 hours ago




Eggs displace water. If you filled the thing with no eggs and all water, then added eggs, the water would overflow. More eggs, more overflowing - less water left.
– J...
2 hours ago












@J...The eggs are not touching the water.
– Taemyr
42 mins ago




@J...The eggs are not touching the water.
– Taemyr
42 mins ago












@Taemyr they do in the egg boiler I have. If they don't touch the water then it's a steamer rather than a boiler, I suppose?
– Aaron F
11 mins ago




@Taemyr they do in the egg boiler I have. If they don't touch the water then it's a steamer rather than a boiler, I suppose?
– Aaron F
11 mins ago










3 Answers
3






active

oldest

votes

















up vote
13
down vote



accepted










Presumably, the rate of the steam escaping the cooker depends on the "resistance" of the steam path: from the opening in the bottom, where the steam enters the dome, to the opening on the side of the dome, from where the steam escapes.



The more eggs in the cooker, the narrower the path, the slower the flow. Also, as relatively slowly moving steam makes contact with more eggs, it is more likely to condense and make its way back to the water at the bottom of the cooker, which further reduces its escape rate.



So, with more eggs in the cooker, a smaller amount of water will last about as long as a greater amount of water with fewer eggs, resulting in a similar degree of cooking.






share|cite|improve this answer





























    up vote
    28
    down vote













    In boiling eggs, we note that each egg displaces a certain amount of water volume in the pot.



    To cook eggs, we want them to be immersed in boiling water- immersed, but no more, because the excess water does not assist in the boiling process.



    Why is this so? Because the water serves only as a heat transfer medium which completely surrounds the egg, and conveys thermal energy from the bottom of the pot to the eggs at a convenient temperature- that of boiling water.



    This means that 1) we want the eggs to be just immersed in the water- but no more, 2) the more eggs we put in the pot, the less water is required to just immerse them- at least up to the limit of having the bottom of the pot completely populated with eggs.






    share|cite|improve this answer
















    • 1




      This seems to miss the implications of "The machine beeps when the water has evaporated, so the eggs are ready." I think the point of confusion is that if there is less water then it will take less time to evaporate so you are cooking the eggs for a smaller amount of time. This answer makes a lot of sense for the normal way of cooking eggs in which they start and end in boiling water but less so for this machine's apparent mode of operation...
      – Chris
      3 hours ago










    • Also following the link to the instructions the amount of water for 7 eggs is 25ml. Even one egg at 55ml you are not covering the eggs at all...
      – Chris
      3 hours ago






    • 3




      Downvoted because even though the question refers to an "egg boiler machine", such machines aren't really egg boilers so much as egg steamers. In particular, the eggs are not immersed in the water in such machines.
      – David Hammen
      2 hours ago


















    up vote
    0
    down vote













    Egg boiling machines are designed to cook eggs that have only a small part submerged in the water.



    To ensure that the same volume is submerged regardless of the number of eggs, you need to add more water as you reduce the number of eggs.



    This is because of displacement rather than thermodynamics. Fewer eggs displace less water, so more water is required.






    share|cite|improve this answer








    New contributor




    Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.













    • 1




      Actually, the eggs in such an egg cooker never touch the water at all. So eggs displacing the water isn't the answer, as discussed in the comments under one of the other answers.
      – Arthur
      1 hour ago











    • With the one I have - bosch-home.co.uk/supportdetail/product/TEK1101GB/01#/… - the eggs are definitely partly submerged in the water. Perhaps other egg cookers (specifically egg steamers ) work slightly differently to the one I have?
      – Aaron F
      13 mins ago










    • The one i had when I grew up didn't. But fair enough.
      – Arthur
      9 mins ago










    Your Answer




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    3 Answers
    3






    active

    oldest

    votes








    3 Answers
    3






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes








    up vote
    13
    down vote



    accepted










    Presumably, the rate of the steam escaping the cooker depends on the "resistance" of the steam path: from the opening in the bottom, where the steam enters the dome, to the opening on the side of the dome, from where the steam escapes.



    The more eggs in the cooker, the narrower the path, the slower the flow. Also, as relatively slowly moving steam makes contact with more eggs, it is more likely to condense and make its way back to the water at the bottom of the cooker, which further reduces its escape rate.



    So, with more eggs in the cooker, a smaller amount of water will last about as long as a greater amount of water with fewer eggs, resulting in a similar degree of cooking.






    share|cite|improve this answer


























      up vote
      13
      down vote



      accepted










      Presumably, the rate of the steam escaping the cooker depends on the "resistance" of the steam path: from the opening in the bottom, where the steam enters the dome, to the opening on the side of the dome, from where the steam escapes.



      The more eggs in the cooker, the narrower the path, the slower the flow. Also, as relatively slowly moving steam makes contact with more eggs, it is more likely to condense and make its way back to the water at the bottom of the cooker, which further reduces its escape rate.



      So, with more eggs in the cooker, a smaller amount of water will last about as long as a greater amount of water with fewer eggs, resulting in a similar degree of cooking.






      share|cite|improve this answer
























        up vote
        13
        down vote



        accepted







        up vote
        13
        down vote



        accepted






        Presumably, the rate of the steam escaping the cooker depends on the "resistance" of the steam path: from the opening in the bottom, where the steam enters the dome, to the opening on the side of the dome, from where the steam escapes.



        The more eggs in the cooker, the narrower the path, the slower the flow. Also, as relatively slowly moving steam makes contact with more eggs, it is more likely to condense and make its way back to the water at the bottom of the cooker, which further reduces its escape rate.



        So, with more eggs in the cooker, a smaller amount of water will last about as long as a greater amount of water with fewer eggs, resulting in a similar degree of cooking.






        share|cite|improve this answer














        Presumably, the rate of the steam escaping the cooker depends on the "resistance" of the steam path: from the opening in the bottom, where the steam enters the dome, to the opening on the side of the dome, from where the steam escapes.



        The more eggs in the cooker, the narrower the path, the slower the flow. Also, as relatively slowly moving steam makes contact with more eggs, it is more likely to condense and make its way back to the water at the bottom of the cooker, which further reduces its escape rate.



        So, with more eggs in the cooker, a smaller amount of water will last about as long as a greater amount of water with fewer eggs, resulting in a similar degree of cooking.







        share|cite|improve this answer














        share|cite|improve this answer



        share|cite|improve this answer








        edited 27 mins ago

























        answered 11 hours ago









        V.F.

        7,8712722




        7,8712722




















            up vote
            28
            down vote













            In boiling eggs, we note that each egg displaces a certain amount of water volume in the pot.



            To cook eggs, we want them to be immersed in boiling water- immersed, but no more, because the excess water does not assist in the boiling process.



            Why is this so? Because the water serves only as a heat transfer medium which completely surrounds the egg, and conveys thermal energy from the bottom of the pot to the eggs at a convenient temperature- that of boiling water.



            This means that 1) we want the eggs to be just immersed in the water- but no more, 2) the more eggs we put in the pot, the less water is required to just immerse them- at least up to the limit of having the bottom of the pot completely populated with eggs.






            share|cite|improve this answer
















            • 1




              This seems to miss the implications of "The machine beeps when the water has evaporated, so the eggs are ready." I think the point of confusion is that if there is less water then it will take less time to evaporate so you are cooking the eggs for a smaller amount of time. This answer makes a lot of sense for the normal way of cooking eggs in which they start and end in boiling water but less so for this machine's apparent mode of operation...
              – Chris
              3 hours ago










            • Also following the link to the instructions the amount of water for 7 eggs is 25ml. Even one egg at 55ml you are not covering the eggs at all...
              – Chris
              3 hours ago






            • 3




              Downvoted because even though the question refers to an "egg boiler machine", such machines aren't really egg boilers so much as egg steamers. In particular, the eggs are not immersed in the water in such machines.
              – David Hammen
              2 hours ago















            up vote
            28
            down vote













            In boiling eggs, we note that each egg displaces a certain amount of water volume in the pot.



            To cook eggs, we want them to be immersed in boiling water- immersed, but no more, because the excess water does not assist in the boiling process.



            Why is this so? Because the water serves only as a heat transfer medium which completely surrounds the egg, and conveys thermal energy from the bottom of the pot to the eggs at a convenient temperature- that of boiling water.



            This means that 1) we want the eggs to be just immersed in the water- but no more, 2) the more eggs we put in the pot, the less water is required to just immerse them- at least up to the limit of having the bottom of the pot completely populated with eggs.






            share|cite|improve this answer
















            • 1




              This seems to miss the implications of "The machine beeps when the water has evaporated, so the eggs are ready." I think the point of confusion is that if there is less water then it will take less time to evaporate so you are cooking the eggs for a smaller amount of time. This answer makes a lot of sense for the normal way of cooking eggs in which they start and end in boiling water but less so for this machine's apparent mode of operation...
              – Chris
              3 hours ago










            • Also following the link to the instructions the amount of water for 7 eggs is 25ml. Even one egg at 55ml you are not covering the eggs at all...
              – Chris
              3 hours ago






            • 3




              Downvoted because even though the question refers to an "egg boiler machine", such machines aren't really egg boilers so much as egg steamers. In particular, the eggs are not immersed in the water in such machines.
              – David Hammen
              2 hours ago













            up vote
            28
            down vote










            up vote
            28
            down vote









            In boiling eggs, we note that each egg displaces a certain amount of water volume in the pot.



            To cook eggs, we want them to be immersed in boiling water- immersed, but no more, because the excess water does not assist in the boiling process.



            Why is this so? Because the water serves only as a heat transfer medium which completely surrounds the egg, and conveys thermal energy from the bottom of the pot to the eggs at a convenient temperature- that of boiling water.



            This means that 1) we want the eggs to be just immersed in the water- but no more, 2) the more eggs we put in the pot, the less water is required to just immerse them- at least up to the limit of having the bottom of the pot completely populated with eggs.






            share|cite|improve this answer












            In boiling eggs, we note that each egg displaces a certain amount of water volume in the pot.



            To cook eggs, we want them to be immersed in boiling water- immersed, but no more, because the excess water does not assist in the boiling process.



            Why is this so? Because the water serves only as a heat transfer medium which completely surrounds the egg, and conveys thermal energy from the bottom of the pot to the eggs at a convenient temperature- that of boiling water.



            This means that 1) we want the eggs to be just immersed in the water- but no more, 2) the more eggs we put in the pot, the less water is required to just immerse them- at least up to the limit of having the bottom of the pot completely populated with eggs.







            share|cite|improve this answer












            share|cite|improve this answer



            share|cite|improve this answer










            answered 11 hours ago









            niels nielsen

            10.6k41732




            10.6k41732







            • 1




              This seems to miss the implications of "The machine beeps when the water has evaporated, so the eggs are ready." I think the point of confusion is that if there is less water then it will take less time to evaporate so you are cooking the eggs for a smaller amount of time. This answer makes a lot of sense for the normal way of cooking eggs in which they start and end in boiling water but less so for this machine's apparent mode of operation...
              – Chris
              3 hours ago










            • Also following the link to the instructions the amount of water for 7 eggs is 25ml. Even one egg at 55ml you are not covering the eggs at all...
              – Chris
              3 hours ago






            • 3




              Downvoted because even though the question refers to an "egg boiler machine", such machines aren't really egg boilers so much as egg steamers. In particular, the eggs are not immersed in the water in such machines.
              – David Hammen
              2 hours ago













            • 1




              This seems to miss the implications of "The machine beeps when the water has evaporated, so the eggs are ready." I think the point of confusion is that if there is less water then it will take less time to evaporate so you are cooking the eggs for a smaller amount of time. This answer makes a lot of sense for the normal way of cooking eggs in which they start and end in boiling water but less so for this machine's apparent mode of operation...
              – Chris
              3 hours ago










            • Also following the link to the instructions the amount of water for 7 eggs is 25ml. Even one egg at 55ml you are not covering the eggs at all...
              – Chris
              3 hours ago






            • 3




              Downvoted because even though the question refers to an "egg boiler machine", such machines aren't really egg boilers so much as egg steamers. In particular, the eggs are not immersed in the water in such machines.
              – David Hammen
              2 hours ago








            1




            1




            This seems to miss the implications of "The machine beeps when the water has evaporated, so the eggs are ready." I think the point of confusion is that if there is less water then it will take less time to evaporate so you are cooking the eggs for a smaller amount of time. This answer makes a lot of sense for the normal way of cooking eggs in which they start and end in boiling water but less so for this machine's apparent mode of operation...
            – Chris
            3 hours ago




            This seems to miss the implications of "The machine beeps when the water has evaporated, so the eggs are ready." I think the point of confusion is that if there is less water then it will take less time to evaporate so you are cooking the eggs for a smaller amount of time. This answer makes a lot of sense for the normal way of cooking eggs in which they start and end in boiling water but less so for this machine's apparent mode of operation...
            – Chris
            3 hours ago












            Also following the link to the instructions the amount of water for 7 eggs is 25ml. Even one egg at 55ml you are not covering the eggs at all...
            – Chris
            3 hours ago




            Also following the link to the instructions the amount of water for 7 eggs is 25ml. Even one egg at 55ml you are not covering the eggs at all...
            – Chris
            3 hours ago




            3




            3




            Downvoted because even though the question refers to an "egg boiler machine", such machines aren't really egg boilers so much as egg steamers. In particular, the eggs are not immersed in the water in such machines.
            – David Hammen
            2 hours ago





            Downvoted because even though the question refers to an "egg boiler machine", such machines aren't really egg boilers so much as egg steamers. In particular, the eggs are not immersed in the water in such machines.
            – David Hammen
            2 hours ago











            up vote
            0
            down vote













            Egg boiling machines are designed to cook eggs that have only a small part submerged in the water.



            To ensure that the same volume is submerged regardless of the number of eggs, you need to add more water as you reduce the number of eggs.



            This is because of displacement rather than thermodynamics. Fewer eggs displace less water, so more water is required.






            share|cite|improve this answer








            New contributor




            Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.













            • 1




              Actually, the eggs in such an egg cooker never touch the water at all. So eggs displacing the water isn't the answer, as discussed in the comments under one of the other answers.
              – Arthur
              1 hour ago











            • With the one I have - bosch-home.co.uk/supportdetail/product/TEK1101GB/01#/… - the eggs are definitely partly submerged in the water. Perhaps other egg cookers (specifically egg steamers ) work slightly differently to the one I have?
              – Aaron F
              13 mins ago










            • The one i had when I grew up didn't. But fair enough.
              – Arthur
              9 mins ago














            up vote
            0
            down vote













            Egg boiling machines are designed to cook eggs that have only a small part submerged in the water.



            To ensure that the same volume is submerged regardless of the number of eggs, you need to add more water as you reduce the number of eggs.



            This is because of displacement rather than thermodynamics. Fewer eggs displace less water, so more water is required.






            share|cite|improve this answer








            New contributor




            Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.













            • 1




              Actually, the eggs in such an egg cooker never touch the water at all. So eggs displacing the water isn't the answer, as discussed in the comments under one of the other answers.
              – Arthur
              1 hour ago











            • With the one I have - bosch-home.co.uk/supportdetail/product/TEK1101GB/01#/… - the eggs are definitely partly submerged in the water. Perhaps other egg cookers (specifically egg steamers ) work slightly differently to the one I have?
              – Aaron F
              13 mins ago










            • The one i had when I grew up didn't. But fair enough.
              – Arthur
              9 mins ago












            up vote
            0
            down vote










            up vote
            0
            down vote









            Egg boiling machines are designed to cook eggs that have only a small part submerged in the water.



            To ensure that the same volume is submerged regardless of the number of eggs, you need to add more water as you reduce the number of eggs.



            This is because of displacement rather than thermodynamics. Fewer eggs displace less water, so more water is required.






            share|cite|improve this answer








            New contributor




            Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.









            Egg boiling machines are designed to cook eggs that have only a small part submerged in the water.



            To ensure that the same volume is submerged regardless of the number of eggs, you need to add more water as you reduce the number of eggs.



            This is because of displacement rather than thermodynamics. Fewer eggs displace less water, so more water is required.







            share|cite|improve this answer








            New contributor




            Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.









            share|cite|improve this answer



            share|cite|improve this answer






            New contributor




            Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.









            answered 2 hours ago









            Aaron F

            101




            101




            New contributor




            Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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            New contributor





            Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.






            Aaron F is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
            Check out our Code of Conduct.







            • 1




              Actually, the eggs in such an egg cooker never touch the water at all. So eggs displacing the water isn't the answer, as discussed in the comments under one of the other answers.
              – Arthur
              1 hour ago











            • With the one I have - bosch-home.co.uk/supportdetail/product/TEK1101GB/01#/… - the eggs are definitely partly submerged in the water. Perhaps other egg cookers (specifically egg steamers ) work slightly differently to the one I have?
              – Aaron F
              13 mins ago










            • The one i had when I grew up didn't. But fair enough.
              – Arthur
              9 mins ago












            • 1




              Actually, the eggs in such an egg cooker never touch the water at all. So eggs displacing the water isn't the answer, as discussed in the comments under one of the other answers.
              – Arthur
              1 hour ago











            • With the one I have - bosch-home.co.uk/supportdetail/product/TEK1101GB/01#/… - the eggs are definitely partly submerged in the water. Perhaps other egg cookers (specifically egg steamers ) work slightly differently to the one I have?
              – Aaron F
              13 mins ago










            • The one i had when I grew up didn't. But fair enough.
              – Arthur
              9 mins ago







            1




            1




            Actually, the eggs in such an egg cooker never touch the water at all. So eggs displacing the water isn't the answer, as discussed in the comments under one of the other answers.
            – Arthur
            1 hour ago





            Actually, the eggs in such an egg cooker never touch the water at all. So eggs displacing the water isn't the answer, as discussed in the comments under one of the other answers.
            – Arthur
            1 hour ago













            With the one I have - bosch-home.co.uk/supportdetail/product/TEK1101GB/01#/… - the eggs are definitely partly submerged in the water. Perhaps other egg cookers (specifically egg steamers ) work slightly differently to the one I have?
            – Aaron F
            13 mins ago




            With the one I have - bosch-home.co.uk/supportdetail/product/TEK1101GB/01#/… - the eggs are definitely partly submerged in the water. Perhaps other egg cookers (specifically egg steamers ) work slightly differently to the one I have?
            – Aaron F
            13 mins ago












            The one i had when I grew up didn't. But fair enough.
            – Arthur
            9 mins ago




            The one i had when I grew up didn't. But fair enough.
            – Arthur
            9 mins ago










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