BB_TX wrote:
Propane is a liquid under high pressure and changes to a vapor when the pressure is reduced. It does not change back from a vapor state to a liquid state unless repressurized.
This is wrong.
There are temperatures where propane becomes a liquid at atmospheric pressure...The gas liquid thing depends BOTH on pressure AND temperature, not just pressure...and this goes for just about ALL gasses, including CO2 and Oxygen!
And, "propane" that we buy for our campers is not necessarily propane. In fact, in much of the Southern united states, "Liquefied Petroleum Gas" (what we ACTUALLY buy) can be predominately butane which will exist as a liquid at atmospheric pressure and cold-weather temperatures.