[題目] 古典熱力學
[領域]熱力學第一定律
[來源]David R. Gaskell 4th. 習題第6題
[題目]10 mole of ideal gas, in the initial state P1=10atm, T1=300K
are taken round the following cycle.
a) a reversible change of state along a straight line path
on the P-V diagram to the state P=1atm, T=300K
b) a reversible isobaric compression to V=24.6liters,and
c) a reversible constant volume process to P=10atm
how much work is done or by the system during the cycle?
[瓶頸] 我有問題的是a過程
a過程我認為是個"等溫可逆膨脹"過程
，所以利用Wr=nRTln(V2/V1)=10mole*8.314J/mole.K*300K*ln(10)
這樣算出來的W=5.74KJ
可是解答是利用P-V圖，斜直線底下所圍的面積就是功去算出W=123.4KJ
為什麼會算出2個不同的值@@? 還是說a過程並不能視為一個等溫可逆膨脹?
小弟不才，希望板上大大能替我解惑
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