Boiling eggs on machine, why more water for fewer eggs?
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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?
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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add a comment |Â
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?
thermodynamics everyday-life
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
add a comment |Â
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?
thermodynamics everyday-life
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
thermodynamics everyday-life
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.
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.
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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MaKo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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New contributor
MaKo is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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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
add a comment |Â
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
add a comment |Â
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.
add a comment |Â
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.
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
add a comment |Â
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.
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
add a comment |Â
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.
add a comment |Â
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.
add a comment |Â
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.
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.
edited 27 mins ago
answered 11 hours ago
V.F.
7,8712722
7,8712722
add a comment |Â
add a comment |Â
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.
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
add a comment |Â
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.
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
add a comment |Â
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.
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.
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
add a comment |Â
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
add a comment |Â
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.
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
add a comment |Â
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.
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
add a comment |Â
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.
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.
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.
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.
Check out our Code of Conduct.
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
add a comment |Â
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
add a comment |Â
MaKo is a new contributor. Be nice, and check out our Code of Conduct.
MaKo is a new contributor. Be nice, and check out our Code of Conduct.
MaKo is a new contributor. Be nice, and check out our Code of Conduct.
MaKo is a new contributor. Be nice, and check out our Code of Conduct.
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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