Re: Entropy and temprature
- From: stevendaryl3016@xxxxxxxxx (Daryl McCullough)
- Date: 27 Apr 2006 07:46:47 -0700
Nishu says...
Can someone please tell how entropy is related with temprature. If we
cool and an object can it's entroty increase. If yes, then when why
does an object kept in a room cool when it's temprature is greater than
that of room?
Entropy is defined so that
dS = dQ/T
where dS is the change in entropy of some subsystem, dQ is the
heat added to (if positive) or lost by (if negative) the subsystem,
and T is the temperature. If an amount of heat Q is taken from
a system at temperature T1 and transferred to a system at temperature
T2, then the total change in entropy will be given by:
Q/T2 - Q/T1
The first system will lose entropy -Q/T1, and the second will
gain entropy Q/T2. If T1 is greater than T2, then the net change
in entropy will be positive.
So the law of entropy increase implies that heat flows from hot
things to cold things.
--
Daryl McCullough
Ithaca, NY
--
NewsGuy.Com 30Gb $9.95 Carry Forward and On Demand Bandwidth
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- From: Nishu
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