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Ideas for 'The Middle Works (15 vols, ed Boydston)', 'Philosophy of Science' and 'The Philosophy of Logic'

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27. Natural Reality / B. Modern Physics / 4. Standard Model / d. Mass

6807	In Newton mass is conserved, but in Einstein it can convert into energy [Bird]
	Full Idea: According to Newton mass is conserved, while in Einstein's theory mass is not conserved but can be converted into and from energy.
	From: Alexander Bird (Philosophy of Science [1998])
	A reaction: Perhaps this is the most fundamental difference between the theories. It certainly suggests that 'mass' was a conventional concept rather than a natural one. Maybe the relative notion of 'weight' is more natural than 'mass'.