Undergrad 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 'Am I understanding the concept of proper frame of reference?'

MOVING CLOCKS In this section, we show that clocks moving at high speeds run slowly. We construct a clock, called a light clock, using a stick of proper lenght ##L_0##, and two mirrors. The two mirrors face each other, and a pulse of light bounces back and forth betweem them. Each time the light pulse strikes one of the mirrors, say the lower mirror, the clock is said to tick. Between successive ticks the light pulse travels a distance ##2L_0## in the proper reference of frame of the clock...
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