You’ll really feel bad if the temperature hits absolute zero as well 
ah, i need to add more decimal places…
uploading 10.27n now
85 F, 49%, should be about 6.3 grains per cubic foot (based on Jeep’s table).
ahh, i need to convert the pressure, i.e *100
i forgot to do that
will do that
note that it will be in kg/m3
It seems to be moving from the usual parameters of meteorology to obscure data for farming and allied fields (pun not intended)
Is the next step temperature in Kelvins ? :fatalfridge:
what is the url jeep to that calculation you had a screen shot of?
Does this page help? http://www.gorhamschaffler.com/humidity_formulas.htm
I believe this is the site that Jeep’s pic comes from (follow the links to the calculators) http://www.humirel.com/All_about_humidity.htm
yes, that’s the one. Actual link to the calculator is:http://www.humirel.com/All_about_humidity-calculation4.htm
Ouch now my head hurts. Learn something everyday Thanks Jeep
Coyote
I don’t know other weather software what know how to calculate abshum.
It works fine! Now I must only learning what meaning when abshum is 0.06528904 kg/m3 
Eki
yes, i uploaded a new 10.27n, with that 100 * fix…so it should be OK now(but note its as kg/m3)
Could this change to g/m3? My point is; 64.43870 is more easily understand as 0.06443870.
yes, sure
10.27o i will get uploaded today
Works fine with 10.27q
Thanks!
Yea Brian!
You Da Man!
Don’t know anyone else who would add such an esoteric feature to their software just because 1 person requested it.
Thanks for all the effort you put into WD for us.
Now that we’ve got it, can you explain how you’re using it so that others can possibly make use of it?
There’s a local Hod Rod shop that builds engines and does dyno testing that actually requested it…
I guess when they are working on their most “radical” high horsepower engines, they take density altitude and water grains into account, either for the tune up itself or the HP measurements.
I’ve got a high performance sports car manufacturer about 2 miles away (TVR if anyone has heard of them), so maybe they’d be interested. I must admit that I’d have expected the tuning rig to take account of such factors though.