Assertion: proton's mass | /r/HasProperty | 1.007825 u
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Source sentences:
text: For example, the atomic mass unit (1 u) is defined as 1/12 of the mass of a 12C atom—but the atomic mass of a 1H atom (which is a proton plus electron) is 1.007825 u, so each nucleon in 12C has lost, on average, about 0.8% of its mass in the form of binding energy.