工质的压力保持不变的过程称为等压过程,如锅炉中水的汽化过程 ,乏汽在凝汽器中的凝结过程,空气预热器中空气的吸热过程都是压力不变时进行的过程.
由理想气体状态方程pν=R T得T/ν=p/R=常数,即等压过程中温度与比体积成正比.
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