<Table> <Tr> <Td> </Td> <Td> This article may need to be rewritten entirely to comply with Wikipedia's quality standards . You can help . The discussion page may contain suggestions . (March 2018) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article may need to be rewritten entirely to comply with Wikipedia's quality standards . You can help . The discussion page may contain suggestions . (March 2018) </Td> </Tr> <P> In physics, the proton - to - electron mass ratio, μ or β, is simply the rest mass of the proton divided by that of the electron . Because this is a ratio of like - dimensioned physical quantities, it is a dimensionless quantity, a function of the dimensionless physical constants, and has numerical value independent of the system of units, namely: </P> <Dl> <Dd> μ = m / m = 7003183615267389000 ♠ 1836. 152 673 89 (17). </Dd> </Dl>

Ratio of masses of proton and electron is