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

[quantity of matter in a thing]

4 ideas
Mass is a measure of energy content [Einstein]
In Newton mass is conserved, but in Einstein it can convert into energy [Bird]
The mass of protons and neutrinos is mostly binding energy, not the quarks [New Sci.]
Gravitional mass turns out to be the same as inertial mass [New Sci.]