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internal energy vs. temperature

internal energy vs. temperature - Physics Forum

internal energy vs. temperature - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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  #1  
Old 07-02-2004, 02:05 PM
Anja
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Default internal energy vs. temperature



The internal energy is directly proportional to the temperature of the
object.
why is it then not possible to measure the internal energy of a system
directly but only as a change deltaU?



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  #2  
Old 07-03-2004, 12:57 AM
N:dlzc D:aol T:com \(dlzc\)
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Default internal energy vs. temperature

Dear Anja:

"Anja" <[Only registered users see links. ].com> wrote in message
news:40e56b8f$0$200$[Only registered users see links. ].tele.dk. ..

There is the energy that is a body's rest mass.
There is heat energy, that is a function of how much it stores when heated
to its current temperature from absolute 0.
There is EM storage in the form of electric charge, and moving electric
charge.
Energy of motion is not contained solely in the body, but shared between
the body and the observer.

I think you mean the temperature one. What property would allow you to
determine the heat-related internal energy? Do you draw inference as to
what material the body is constructed from, and based on similar
measurements on other similarly constructed bodies, infer how much energy
it takes to heat it up from absolute zero?

I think you simply do the delta U this way, because that is how much energy
it takes to get it above or below ambient. Anything else is an exercise
that yields no result.

David A. Smith


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  #3  
Old 07-04-2004, 01:39 AM
tadchem
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Default internal energy vs. temperature


"Anja" <[Only registered users see links. ].com> wrote in message
news:40e56b8f$0$200$[Only registered users see links. ].tele.dk. ..

'Internal energy' is a very specific term in physics. It is related to the
heat content of a system, the work done by a system, and the chemical
composiiton of a system. It is usually represented by the capital letter E,
as in the following:
[Only registered users see links. ]


The chage in internal energy is not measurable by itself, but is related to
the changes in the heat content dQ and the work done by the system dW, as
*defined* in the First Law of Thermodynamics:

dE = dQ - dW


Tom Davidson
Richmond, VA


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