From: utzoo!watmath!bstempleton
Newsgroups: net.physics
Title: Rest mass
Article-I.D.: watmath.3239
Posted: Tue Aug 10 00:29:18 1982
Received: Tue Aug 10 04:55:40 1982

Where or where does the term 'rest mass' come from that we use?

Everybody knows a photon has no 'rest mass', but who has ever seen a photon
at rest?