How would you describe the mass of a proton and neutron?

Answer 1

How the masses of elementary particles are expressed depends on who you are, or at least on what you do. The obvious way to do it is in straightforward SI units, i.e. in Kg. In these units the proton mass is 1.6726 X 10-27 Kg and the neutron mass is 1.6749 X 10-27 Kg. The people most concerned with particle masses are particle physicists. Einstein's famous equation e = mc2 shows the exchange rate between mass and energy. To most people this is fascinating, but hardly a daily concern. To a scientist working with elementary particles, the interchange between mass and energy is a daily occurrence. To avoid continual finicky calculations, many physicists express particle masses in terms of their energy equivalent. The energy unit used is the electron-Volt, or eV. This is the kinetic energy of an electron which has been accelerated by a potential difference of 1 Volt. The eV is rather small, so most masses are given in MeV or million electron-Volt. The mass of a proton is 938.272 MeV and of a neutron is 939.566 MeV.

Answer 2

The mass of a neutron is approximately equal to the mass of a neutron. Moreover, as an H+ ion is a proton atom, the mass of a proton can be determined as its;1.672621777(74)×10−27 kg[1].