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理想氣體 - Wikipedia

理想氣體

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理想氣體為假想的气体。其特性為:

  • 氣體分子間無作用力
  • 氣體分子本身不占有體積
  • 氣體分子與容器器壁間發生完全彈性碰撞

真實氣體在愈低壓、愈高溫的狀態,性質愈接近理想氣體。最接近理想氣體的氣體為氦氣

[编辑] 理想气体状态方程

理想气体状态方程是描述理想气体处于平衡态时的状态方程。他建立在波以耳定律查理定律盖-吕萨克定律阿伏伽德罗定律等经验定律上。

处于平衡态的气体,其状态由压强P,体积V,和温度T刻划,表达这几个量之间的关系的方程称之为气体的状态方程。不同的气体有不同的状态方程。这些方程通常很复杂。但在压强很小,温度不太高也不太低的情况下,各种气体的行为都趋于理想气体。理想气体的状态方程具有非常简单的形式。

理想气体状态方程一般写作

PV = nRTPV = nKT
其中:
P表理想氣體的壓力單位為大氣壓力(atm);
V表理想氣體的體積,單位為公升(L);
n表理想氣體的摩尔數,單位為摩尔(mol.);
R為理想氣體常數,約為0.082 atm-L/mol-K;
K为波尔兹曼常数,K=1.38066 x 10-23 J/K = 8.617385 x 10-5 eV/K;
T表理想氣體的溫度,單位為絕對溫度(K)。

真实气体的状态方程参见:

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