作者nanokevin (明日幸福今日修)
看板ChemEng
标题Re: [问题] 一题物化
时间Thu Feb 25 12:24:24 2010
※ 引述《spysea ( )》之铭言：
: Show that two phases are in thermal equilibrium only if their
: temperatures are the same.
: 请问一下这一题要从哪里证明起?
: 谢谢回答
equilibrium in an isolated system =>dS = 0
let two phases A and B
dS=dSa+dSb=0
by S=S(U,V)
Assume the system is mechanically rigid=> dV=0
then
dS=(dSa/dUa)v *dUa + (dSb/dUb)v *dUb = (1/Ta)dUa+(1/Tb)dUb=0
Since dUa=-dUb =>Ta=Tb
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1F：推 spysea:谢谢回答 02/25 19:13