How to store the mass of an electron?

Question

Java

9.10938356 × 10-31 in double as 0.000000 ...... 9 ?

Answer 1

It depends on how much it is in relative terms. Let's say you operate with a microcosm, and your maximum mass is 1000 masses of electrons. What prevents us from accepting the mass of an electron as 1 then? And in the interface already multiply. The downside of this is accuracy. But for precise work with ultra-small numbers, in general, separate things are misused.

Answer 2

In principle, the accuracy of double should be enough for the usual calculations of some school-academic problems in physics. However, if this is not enough, it is better to use some alternative units. The user above proposed to measure everything relative to the masses of the electron, which is not bad in principle, but it is difficult to understand and express the masses of other particles. It is possible to use electron volts (eV) to express rest mass. (Well, in this case MeV is better, because 1 eV is too small). In addition, the masses of elementary particles are often given in this form and this information is available.
Me = 0.510 998 9461 MeV
Mp = 938.272 0813 MeV
Mn = 939.565 4133 MeV
1 MeV = 1.782661907e−30kg (to convert to kilograms if required)