作者hihaka2001 (hihaka)
看板Grad-ProbAsk
标题[理工] [热力学]-2nd law
时间Sat Dec 19 23:59:08 2009
请问大家
one mole of an ideal gas at 300K is isothermally compressed by a constant
external pressure equal to the final pressure.
At the end of the process, P=Pex. Because P is not equal to Pex at all but
the final state, this state is "irreverisble" The initial volume is 25L and
the final volume is 10L . The surrounding is 300K
Calculate ΔS ,ΔS (surrounding) ΔS(total)
我的问题是
外界的热量要怎麽算
也就是说ΔS (surrounding)要怎麽算
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1F：推 sokuso123:求出系统损失或得到的热以後 除以环境温度 12/20 00:03
2F：→ hihaka2001:我知道 可是我卡到外界有多少的热要怎麽算 12/20 00:05
3F：→ hihaka2001:有人跟我说用-Q(sys)=Q(surr)吸热=放热可是结果就变成 12/20 00:05
4F：→ hihaka2001:就变成可逆的了== 12/20 00:06
5F：推 IMISSA:是阿 你状态变化放出的热 就是外界吸收的热阿 12/20 00:27
6F：→ hihaka2001:那该怎算啊xd 12/20 01:05