On an MS site, it referred to a document called "Writing a user-defined
worksheet function". I am a long-time Excel user, but don't have VB
experience. I want to create my own finctions that will calculate various
chemical parameters from user input arguements. Can anyone point me int he
right direction?

My needs are pretty simple; I'd like to do things like create a function to
calculate the vapor pressure of water at a specified temperature, so I can
just type "=Pw(25)" to get the answer for 25 °C

Pw=760*EXP(11.8571-(3840.7/(T+273.15))-(216961/(T+273.15)^2))