2007-04-03 02:38:45 · 2 answers · asked by Peter M 1 in Science & Mathematics ➔ Physics
Not rest mass. That is, the sum of the mass at zero velocity of all the particles that participate in a chemical or nuclear reaction changes if the reaction is enothermic or exothermic. The change is virtually imperceptible for chemical reactions, though. That's why, before special relativity, people thought it was conserved. What is conserved is energy E, of which the rest mass m of the constituents mc^2 is but a part. c is the speed of light.
2007-04-03 02:50:26 · answer #1 · answered by Dr. R 7 · 1⤊ 0⤋
fake . all reactions donot stick to regulation of conservation of mass however the version is negligible and consequently neglected. the concept of nuclear reactions is that the loss in mass is switched over into ability. right here is Einstein's eqn : E=mc^2. right here m is easily the loss in weight while reactants are switched over to products.
2016-12-19 19:12:52 · answer #2 · answered by sheck 3 · 0⤊ 0⤋