29. Breakdown of a Relativist Myth: Mass Never Depended on Velocity

It is a most basic tenet, or dogma, of modern physics (special relativity) that the mass of moving bodies should depend on the velocity of their motion. This had been unthinkable on the basis of the Galileian-Newtonian theory of motion, where "mass" (as a shorthand term for "quantity of matter" introduced by Newton) synonymously stood for a certain quantity of matter as a sum of microscopic material particles ("atoms" in the sense of the Ancients) that should be present in a certain macroscopic body.

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