Re: Mass/Energy concepts and terminology

[Jim Green <JMGreen@SISNA.COM>]

At 21:50 10 12 2000 , John wrote:
> In this thread there have been a number of odd statements.  I can't figure
> out which are facetious and which are merely befuddled.
>
> In current professional usage, "mass" means "rest mass".  Indeed, saying
> "rest mass" is a pleonasm, so I'll stop saying it.  The "m" that appears in
> equations like E = m c^2 is this mass.

Well, John, I seem to have ben declared non-professional as I don't use
these meanings in my work.  Nor do my colleagues.

Let me ask the list a question:  Does an iceberg and, if melted, the water
from this iceberg weigh the same?  Would one say that both "substances"
have the same mass?


Jim Green
mailto:JMGreen@sisna.com
http://users.sisna.com/jmgreen