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From: Mikko <mikko.levanto@iki.fi>
Newsgroups: sci.physics.relativity
Subject: Re: What composes the mass of an electron?
Date: Sat, 2 Nov 2024 13:02:47 +0200
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On 2024-11-01 18:13:49 +0000, rhertz said:

> A definition of mass, as found in Google:
> 
> "Mass is a measurement of the amount of matter or substance in an
> object.
> It's the total amount of protons, neutrons, and electrons in an object."

That is not quite correct. When protons, neutrons, and electrons are
put near each other they interact. That interaction contributes to
the mass of the object (usually negatively).

Anyway, the mass of a composite is a consequence of the masses of
its constitiuents. But the mass of an elementary constituent cannot
be a consequence of its constituents because there are none. So we
can only regard the mass of an elementary particle as a primitive
property of that particle.

-- 
Mikko