Originally Posted by Mrs X
Note, it is different for different gases. I use a lot of liquid nitrogen, and the expansion rate from liquid to gas at 20°C (room temperature) is 1L (liquid) to approx 680L (gas).
Absolutely, and the figure I gave is probably only valid for the >95% propane we get in the US and Canada. Other places, LPG is a mixture of propane and butane, and the mix is seasonally adjusted for vapor pressure.
The other way to look at it is that the gas molar volume is about what you would expect from the ideal gas law, and the desnity of the liquid is whatever it happens to be.