作者iasyou (台大化工所~)
看板Chemistry
標題Re: 凡得瓦方程式
時間Wed Apr 5 00:49:33 2006
※ 引述《radiohead627 (春天到了)》之銘言：
: 有人知道怎摸算出V嗎
: 要算出來好像要弄到V的三次方
: 我算不出來@@
(P+a/V^2)(V-b)=RT where V is molar volume
P = RT/(V-b) - a/V^2
at critical point (@P/@V) = (@^2P/@V^2) = 0 sorry,no partial dev. notation.
@ means partial differental. so all P-V-T should be Pc,Vc & Tc
than -RT/(V-b)^2 + 2a/V^3 = 2RT/(V-b)^3 - 6a/V^4 = 0
or RT/(V-b)^2=2a/V^3-----(1) and 2RT/(V-b)^3= 6a/V^4 -----(2)
let (2)/(1) → Vc = 3b & a = 3PcVc^2
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