Programs in thermodynamics and heat transfer:  Light on heat transfer (was that a pun - light, radiation, get it?), long on properties.  Maybe later I can get some good heat transfer programs in here.  For now...

Thermodynamic Properties of Air

Properties of Water

Saturation Steam Pressure

Barometric Pressure Correction

Solar Intensity

Could someone take a look at the solar intensity program?  One small snippet of code was missing.  I made it match the test case using a best guess. Details are on the solar intensity page. In the meantime, use at your own risk.