I Special Theory of Relativity & Conservation of Mass

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The discussion centers on whether the law of conservation of mass conflicts with the first postulate of the special theory of relativity, which states that the laws of physics are the same in all inertial frames. It suggests that the definition of "mass" is crucial to this understanding. The consensus is that if mass is conserved in one inertial reference frame, it remains conserved in all frames, indicating no conflict exists. Participants encourage further clarification of thoughts to enhance the discussion. Overall, the law of conservation of mass aligns with the principles of relativity.
Sonuz
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Does the law of conservation of mass fail to meet the first postulate of the special theory of relativity(the laws of physics are the same in all inertial frames of reference)?
 
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Depends how you're defining "mass".
 
As with your last thread, if you explain your thinking a bit more we'll be able to give more helpful answers.
 
Sonuz said:
Does the law of conservation of mass fail to meet the first postulate of the special theory of relativity(the laws of physics are the same in all inertial frames of reference)?
Conservation means does not change over time. What the first postulate would say is:

If mass is conserved in one inertial reference frame, then it is conserved in them all.
 
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Sonuz said:
Does the law of conservation of mass fail to meet the first postulate of the special theory of relativity(the laws of physics are the same in all inertial frames of reference)?
No. Why do you think it might conflict?
 

Thread 'Jackson: justification of the Poynting vector by GR'

The Poynting vector is a definition, that is supposed to represent the energy flow at each point. Unfortunately, the only observable effect caused by the Poynting vector is through the energy variation in a volume subject to an energy flux through its surface, that is, the Poynting theorem. As a curl could be added to the Poynting vector without changing the Poynting theorem, it can not be decided by EM only that this should be the actual flow of energy at each point. Feynman, commenting...
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