From: utzoo!decvax!duke!harpo!floyd!rhm
Newsgroups: net.space,net.physics
Title: Re: Equivalence of Mass and Energy
Article-I.D.: floyd.429
Posted: Sun Aug  8 22:19:39 1982
Received: Mon Aug  9 05:09:07 1982


O.K. I will reply specifically to duke!phs!jfh

1.  If four hydrogen atoms conspire somehow to form a helium atom, then
    the mass of the helium is exactly that of the hydrogen atoms.

2.  Mass and energy are the same.

3.  Yes, the mass of a collection of particles increases if they are heated.

4.  Energy exerts gravity.

Altogether, rest mass doesn't have much do with anything.

These positions may or may not be defensible, but I will let any physics
text do the defending for me.  They are hardly disputed questions.