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A proton is a stable subatomic particle, symbol p, H +, or 1 H + with a positive electric charge of +1 e (elementary charge).Its mass is slightly less than the mass of a neutron and approximately 1836 times the mass of an electron (the proton-to-electron mass ratio).
proton mass 1.672 621 925 95 (52) × ... but the kilogram is not exactly known when using these units, the opposite of when expressing the same quantities using the ...
proton mass m p = 1.672 621 925 95 (52) × 10 −27 kg: u r (m p) = 3.1 × 10 −10 [63] mp_Da: proton mass in daltons: m p = 1.007 276 466 5789 (83) Da: u r (m p) = 8.3 × 10 −12 [64] mp/me: proton-to-electron mass ratio: m p /m e = 1 836.152 673 426 (32) u r (m p /m e) = 1.7 × 10 −11 [65] mpc2: proton mass energy ...
Alternately, the atomic mass of a carbon-12 atom may be expressed in any other mass units: for example, the atomic mass of a carbon-12 atom is 1.992 646 882 70 (62) × 10 −26 kg. As is the case for the related atomic mass when expressed in daltons , the relative isotopic mass numbers of nuclides other than carbon-12 are not whole numbers, but ...
2.176 434 (24) × 10 −8 kg ... the strength of gravity simply is what it is, a primary quantity, while the proton's mass is the tiny number 1/13 quintillion.
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For example, the mass of an unbound atom of the common hydrogen isotope (hydrogen-1, protium) is 1.007 825 032 241 (94) Da, [a] the mass of a proton is 1.007 276 466 5789 (83) Da, [7] the mass of a free neutron is 1.008 664 916 06 (40) Da, [8] and the mass of a hydrogen-2 (deuterium) atom is 2.014 101 778 114 (122) Da. [9]
The masses of the proton and neutron are similar: for the proton it is 1.6726 × 10 −27 kg (938.27 MeV/c 2), while for the neutron it is 1.6749 × 10 −27 kg (939.57 MeV/c 2); the neutron is roughly 0.13% heavier. The similarity in mass can be explained roughly by the slight difference in masses of up quarks and down quarks composing the ...