水和蒸汽的体膨胀系数和压缩率是反应堆热工水力、传热学和工程热力学中常用的参数之一。这两个参数的计算公式是Gibbs折合自由焓和Helmholtz折合自由能的导出函数。水和蒸汽的体膨胀系数和压缩率的提出,解决了传热学、工程热力学和核反应堆热工水力学的实际应用问题。在反应堆热工水力设计中,可以直接利用这两个参数来求解流体的温度和压力,比反复利用质量、能量和动量方程求解流体的温度和压力大大节省计算时间和 Volume expansion and compressibility of water and steam are one of the most commonly used parameters in reactor thermodynamics, heat transfer and engineering thermodynamics. The calculation of these two parameters is Gibbs free enthalpy and Helmholtz free energy derived function. Propagating coefficient of body expansion and compressibility of water and steam solved the practical application of heat transfer, engineering thermodynamics and thermal hydraulics of nuclear reactors. In the reactor thermal hydraulic design, the two parameters can be directly used to solve the temperature and pressure of the fluid, and the time and pressure can be saved greatly by repeatedly using the mass, energy and momentum equations to solve the fluid temperature and pressure