Is there a magic formula for converting lbs of something to water gallons? I do not have to be accurate to the Nth degree, just in the ballpark.
Examples
How many water gallons is 600 lbs of R-22 refrigerant?
How many water gallons is 20 lbs of propane (blowtorch tanks)?
Etc. etc.
I need to do this for reporting requirements. The form specifies flammable gas and non-flammable gas amounts in "water gallon capacities" so I need to know how much I have in "water gallon capacity" to find out if I'm required to report it or not.
Thanks for any help