Physics Forums

Physics Forums (http://www.physicsforums.com/index.php)
-   Classical Physics (http://www.physicsforums.com/forumdisplay.php?f=61)
-   -   Temperature Concept? (http://www.physicsforums.com/showthread.php?t=657192)

M. next Dec6-12 08:06 AM

Temperature Concept?
 
what is the difference between emperical and thermodynamic temperature?

Philip Wood Dec6-12 09:24 AM

Re: Temperature Concept?
 
An empirical temperature is defined as linearly related to some specific property of a substance or system, such as its electrical resistance. So if we had a copper resistance thermometer and a platinum resistance thermometer and calibrated them at the ice and steam point, there'd be no reason to expect them to give exactly the same reading at some intermediate temperature.

Thermodynamic temperature is based, not on the property of a particular substance, but upon the universally applicable Second Law of Thermodynamics. To measure temperatures on this scale we have to have a theory which links readings (on say a gas thermometer) to the thermodynamic scale. It turns out that for gases at very low densities, the thermodynamic temperature ratio is close to the ratio of gas pressures.

Philip Wood Dec8-12 12:05 PM

Re: Temperature Concept?
 
M. next: Was this reply of any help? Does it need clarification? If so, where specifically?

M. next Dec9-12 04:52 AM

Re: Temperature Concept?
 
Thank you Philip. It is perfectly illustrated, I understood it.


All times are GMT -5. The time now is 04:37 AM.

Powered by vBulletin Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
© 2014 Physics Forums