On 4/4/22 07:25, David Mertz, Ph.D. wrote:
On Mon, Apr 4, 2022, 12:53 AM Brian McCall
> An electron volt is a unit of energy. Or of mass. Or of momentum.
An electron volt is a unit of energy and only a unit of energy.
Knowing a particle's energy (in certain situations) means that you
also know other physical quantities about that object, and so in
casual conversation (and the occasional poorly reviewed journal
article) you find them used interchangeably.
This is just flatly wrong of usage in particle physics. Electron volts
are precisely the default units used to describe the mass of subatomic
particles.
I beg to disagree here, here---mass is measured in eV / c^2, and
momentum in eV / c. (Although, as Brian says, we're all guilty of taking
shortcuts in conversations.)
Would it help if we stopped saying "units" and instead referred to
"standard units"?
Yes, limiting the idea to ""SI units" would cover far less. And
thereby have far less motivation to change Python syntax rather than
use a library.
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