物理学 13-3理想气体的等体和等压过程摩尔热容 第五版 热力学第一定律 irst law of thermodynamics do=de +dw 、么、M%dT+ Pdv pd= rdt dQ= dep M y,m +R)dT v m (2-71)+P(2-V1)=(Cm+R2-T1 定压摩尔热容:理想气体在等压过程中吸收的 热量lQ,使温度升高dT,其定压摩尔热容为: Isobaric molar heat capacity: Assume one mole ofthe ideal gas absorbs an infinitesimal amount of heat depin an infinitesimal isochoric process, the temperature ofthe gas up dT,then the isobaric molar heat capacity is c 1 dep P m'/m dT 单位(Unin):JmK 第十三章热力学基础 9/1213-3 理想气体的等体和等压过程 摩尔热容 第十三章 热力学基础 物理学 第五版 9/12 定压摩尔热容:理想气体在等压过程中吸收的 热量dQP，使温度升高dT, 其定压摩尔热容为： d d Q E dW = + , d d d P V m m Q C T P V M  = + , 2 1 2 1 , 2 1 ( ) ( ) ( )( ) P V m V m m m Q C T T P V V C R T T M M   = − + − = + − 热力学第一定律 First law of thermodynamics Isobaric molar heat capacity:Assume one mole of the ideal gas absorbs an infinitesimal amount of heat dQP in an infinitesimal isochoric process,the temperature of the gas up dT,then the isobaric molar heat capacity is , m 1 d / d P P Q C m M T =  单位(Unit):J/mol.K d m PdV R T M  = , d ( ) d P V m m Q C R T M  = +