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# Elementary thermodynamics question

## Elementary thermodynamics question - Physics Forum

### Elementary thermodynamics question - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#1
05-06-2006, 04:07 PM
 Boo Guest Posts: n/a
Elementary thermodynamics question

Hi,

I've just bought CBP Finn's book "Thermal Physics" and on
page 5 just after his statement of the 0th Law ("If each of two systems is in
thermal equilibrium with a third, they are in equilibrium with another") there
is the following statement :

"The temperature of a system is a property that determines whether or not that
system is in thermal equilibrium with another.

More formal mathematical arguments may be developed to show the existence of
temperature but we shall not go into them here..." He then gives references to
"Equilibrium Thermodynamics" by CJ Adkins and "Heat and Thermodynamics" by MW
Zemansky and RH Dittman.

I would just go to the references, but unfortunately I don't currently have
care to take the time to sketch an elementary mathematical argument that proves
the existence of temperature as property of systems ?

Many thanks,

Boo
#2
05-06-2006, 04:31 PM
 N:dlzc D:aol T:com \(dlzc\) Guest Posts: n/a
Elementary thermodynamics question

Dear Boo:

"Boo" <[Only registered users see links. ]> wrote in
message news:[Only registered users see links. ].. .
....

[Only registered users see links. ]
[Only registered users see links. ]
[Only registered users see links. ]

Consider that a thermocouple or thermometer is a small system.
If said system yields a certain value, it is said to be
indicating a certain temperature. This indication is a function
(only) of internal energy of this system; and doesn't care if the
system it is in contact (and equilibrium) with is a rectum, a
Bose-Einstein condensate, or a bunsen burner flame. If the
temperature-measurement-system is constructed to withstand the
temperature, you've got an indication you can trust of the
internal energy of the measured system... *because* of the "0th
law".

David A. Smith

 Tags elementary , question , thermodynamics

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