<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>
<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>
ratio of masses of proton and electron is
ratio of masses of proton and electron is
proton - to - electron mass ratio μ β
proton - to - electron mass ratio μ β