Which frame of reference is used for rest mass calculation?

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If there are no special reference frames or absolute rest frames, then rest mass of, say electron, is defined with respect to which frame?



Why cannot such a frame be used as the absolute rest frame?






special-relativity mass reference-frames







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    If there are no special reference frames or absolute rest frames, then rest mass of, say electron, is defined with respect to which frame?



    Why cannot such a frame be used as the absolute rest frame?






    special-relativity mass reference-frames







    share|cite|improve this question























      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite











      If there are no special reference frames or absolute rest frames, then rest mass of, say electron, is defined with respect to which frame?



      Why cannot such a frame be used as the absolute rest frame?






      special-relativity mass reference-frames







      share|cite|improve this question













      If there are no special reference frames or absolute rest frames, then rest mass of, say electron, is defined with respect to which frame?



      Why cannot such a frame be used as the absolute rest frame?






      special-relativity mass reference-frames




      special-relativity mass reference-frames






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      asked 4 hours ago









      karthikeyan

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          2 Answers
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          A better term instead of “rest mass” is “invariant mass”. This quantity is defined by the equation $m^2 c^2=E^2/c^2-p^2$ where m is the invariant mass, E is the total energy, p is the momentum, and c is the speed of light.



          This quantity can be calculated in any inertial reference frame and will give the same value. This is the quantity that particle physicists refer to when they talk about the mass of an electron or photon or other particle. It is the same as the rest mass, but the term invariant mass is preferred since it is more precise and general






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            For a specific particle there is a frame in which the particle is in rest. But there is no frame that is in rest in universe.






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              2 Answers
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              2 Answers
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              A better term instead of “rest mass” is “invariant mass”. This quantity is defined by the equation $m^2 c^2=E^2/c^2-p^2$ where m is the invariant mass, E is the total energy, p is the momentum, and c is the speed of light.



              This quantity can be calculated in any inertial reference frame and will give the same value. This is the quantity that particle physicists refer to when they talk about the mass of an electron or photon or other particle. It is the same as the rest mass, but the term invariant mass is preferred since it is more precise and general






              share|cite|improve this answer
























                up vote
                2
                down vote













                A better term instead of “rest mass” is “invariant mass”. This quantity is defined by the equation $m^2 c^2=E^2/c^2-p^2$ where m is the invariant mass, E is the total energy, p is the momentum, and c is the speed of light.



                This quantity can be calculated in any inertial reference frame and will give the same value. This is the quantity that particle physicists refer to when they talk about the mass of an electron or photon or other particle. It is the same as the rest mass, but the term invariant mass is preferred since it is more precise and general






                share|cite|improve this answer






















                  up vote
                  2
                  down vote










                  up vote
                  2
                  down vote









                  A better term instead of “rest mass” is “invariant mass”. This quantity is defined by the equation $m^2 c^2=E^2/c^2-p^2$ where m is the invariant mass, E is the total energy, p is the momentum, and c is the speed of light.



                  This quantity can be calculated in any inertial reference frame and will give the same value. This is the quantity that particle physicists refer to when they talk about the mass of an electron or photon or other particle. It is the same as the rest mass, but the term invariant mass is preferred since it is more precise and general






                  share|cite|improve this answer












                  A better term instead of “rest mass” is “invariant mass”. This quantity is defined by the equation $m^2 c^2=E^2/c^2-p^2$ where m is the invariant mass, E is the total energy, p is the momentum, and c is the speed of light.



                  This quantity can be calculated in any inertial reference frame and will give the same value. This is the quantity that particle physicists refer to when they talk about the mass of an electron or photon or other particle. It is the same as the rest mass, but the term invariant mass is preferred since it is more precise and general







                  share|cite|improve this answer












                  share|cite|improve this answer



                  share|cite|improve this answer










                  answered 1 hour ago









                  Dale

                  1,692415




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                      up vote
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                      For a specific particle there is a frame in which the particle is in rest. But there is no frame that is in rest in universe.






                      share|cite|improve this answer
























                        up vote
                        1
                        down vote













                        For a specific particle there is a frame in which the particle is in rest. But there is no frame that is in rest in universe.






                        share|cite|improve this answer






















                          up vote
                          1
                          down vote










                          up vote
                          1
                          down vote









                          For a specific particle there is a frame in which the particle is in rest. But there is no frame that is in rest in universe.






                          share|cite|improve this answer












                          For a specific particle there is a frame in which the particle is in rest. But there is no frame that is in rest in universe.







                          share|cite|improve this answer












                          share|cite|improve this answer



                          share|cite|improve this answer










                          answered 4 hours ago









                          md2perpe

                          42326




                          42326



























                               

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