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在物质的热力学性质中,定压比热容C_p是一个相当重要的物理量。以往C_p的测定往往是用间歇法。本文所述的是流动法,该方法的最大优点在于,当物流处于稳定流动状态时,所测得的定压比热容C_p的数值与装置本身的热容量无关,这对于求得准确的C_p数值是至关重要的。 本文所测得的低压下水蒸汽的定压比热容C_p与由美国国家标准计量局(NBS)所发表的带有计算程序的HGK水的状态方程[1]
Among the thermodynamic properties of materials, the constant pressure specific heat capacity C_p is a very important physical quantity. In the past, C_p was often measured by batch method. The flow method is described here. The biggest advantage of this method is that when the flow is in a steady flow state, the measured constant heat capacity C_p of the constant pressure is independent of the heat capacity of the device itself, which is to obtain accurate Cp values. Important. The constant specific heat capacity C_p of water vapor at low pressure measured in this paper and the equation of state of HGK water with calculation program published by the National Bureau of Standards and Metrology (NBS)[1]