Nice to know about this tool, very useful,
My results are slightly different, but the process in question is not isothermal, isobaric, or isochoric, the constant is enthalpy...
For future reference, I did figure out that you can calculate the Joule-Thomson coefficient using Van der Waals constants.
Another option uses Beattie-Bridgeman constants.
So I was able to figure it out from those known values.
I've been scouring the web in search of a Joule Thomson coefficient value for methane, but so far no luck.
I have the volume, temperature, and specific heat as well... so I could also use the coefficient of thermal expansion for methane.. but I can't find that anywhere either!!