作者hihaka2001 (hihaka)
看板Grad-ProbAsk
標題[理工] [熱力學]-2nd law
時間Sat Dec 19 23:59:08 2009
請問大家
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)
我的問題是
外界的熱量要怎麼算
也就是說ΔS (surrounding)要怎麼算
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推 sokuso123:求出系統損失或得到的熱以後 除以環境溫度 12/20 00:03
→ hihaka2001:我知道 可是我卡到外界有多少的熱要怎麼算 12/20 00:05
→ hihaka2001:有人跟我說用-Q(sys)=Q(surr)吸熱=放熱可是結果就變成 12/20 00:05
→ hihaka2001:就變成可逆的了== 12/20 00:06
推 IMISSA:是阿 你狀態變化放出的熱 就是外界吸收的熱阿 12/20 00:27
→ hihaka2001:那該怎算啊xd 12/20 01:05