Quote: (Originally Posted by
Gilles)
Off memory getting pretty old now....
P1V1/T1=P2V2/T2
Pressures in bar, Volume in L, and Temperature in deg Kelvin
Pressure will vary more with He than other gases mentioned because it is less compressible, pressure dependant factor around .85 for our uses.
Hope this helps (and is at least partially correct)
Actualy since V1 and V2 are equal you get P1/T1=P2/T2 or P1/P2=T1/T2
You can do it Bar and Kelvin or PSI and Rankin, whichever you prefer. For more acurate conversions you need Van Der Whals equations found in a P chem textbook but if you are only worried about changes in P for changes in T probably not worth the effort.