The values of density, viscosity, specific heat, thermal conductivity etc. of water, steam and air are necessary for designing various food processing. The values vary with the temperature during food processing. These values must be obtained from the tables, figures and various empirical equations. We must select a useful equation from the reported equations. In this study, we sutudied the convenient equations for personal computer by using the linear least square method. The equations obtained will be useful to rough estimate of various physical propertis regarding temperature of water, steam and air etc.