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- From: sichase@csa2.lbl.gov (SCOTT I CHASE)
- Newsgroups: sci.physics
- Subject: Re: Converting the masses
- Message-ID: <24826@dog.ee.lbl.gov>
- Date: 23 Jul 92 19:37:48 GMT
- References: <n0596t@ofa123.fidonet.org> <mcirvin.711489157@husc10> <9868@sun13.scri.fsu.edu> <1992Jul22.193837.18095@sfu.ca> <mcirvin.711904014@husc8>
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- In article <mcirvin.711904014@husc8>, mcirvin@husc8.harvard.edu (Mcirvin) writes...
- >
- >Actually, neither definition of mass would be temperature-independent,
- >if you define it for the whole lump of coal. When you raise the
- >temperature, the energy in the rest frame increases! The sum of
- >the masses of all the particles is perhaps temperature-independent,
- >but as you complained before, that's not the mass of the lump.
-
- But inertial mass *can* be termperature dependent. Consider experiments
- now being done to "weigh" molecules in Penning traps and other such devices.
- They are getting (soon) to the precision where you can actually "weigh" the
- molecular bond between two atoms (i.e., detect the difference between the
- mass of two protons + two electrons vs. a hydrogen molecule which is the
- result of the binding energy). If you had a sufficiently hot sample
- of hydrogen, in which some molecules were in excited molecular orbitals,
- and you weigh some of these molecules, you will find that the inertial
- mass is different for molecules in different orbital configurations -
- the mass of a hydrogen atom depends on the temperature of the gas.
-
- -Scott
- --------------------
- Scott I. Chase "The question seems to be of such a character
- SICHASE@CSA2.LBL.GOV that if I should come to life after my death
- and some mathematician were to tell me that it
- had been definitely settled, I think I would
- immediately drop dead again." - Vandiver
-