Re: Another Matter,

Posted by
Bill Gill on Apr 09, 2002 at 21:33

Re: Another Matter, (Dogrock)

When a chemical reaction occurs then matter and energy are interchanged. If an exothermic reaction (one in which heat is released) occurs then a very small portion of the mass of the reactants is converted to energy. If an endothermic reaction (one in which heat is absorbed) occurs a very small portion of the energy in the environment is converted to matter. There is no apparent change in mass because the amount of mass converted is so small that it is unmeasurable.

When a photon is absorbed/produced during the change in orbit of an electron the mass of the atom does change, but again the change compared to the total mass of the atom is effectively (but not actually) zero.

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