IF97

使用IF97计算水和水蒸气性质的代码。本代码使用VB.net编写，可稍作修改后在VBA中使用，详细见代码中注释。 Code for calculating water and water vapor properties using IF97. This code is written by VB.net, and can be used in VBA after a little modification. See the comments in the code for details.