How does gas cylinder work?
LPG is stored under pressure, as a liquid, in a gas bottle.
LPG gases can all be compressed into liquid at relatively low pressures.
LPG liquid boils and turns back into gas vapour when you release some of the pressure in the gas bottle by turning on your gas appliance.
The LPG gas vapour is held in the top of the bottle and the liquid LPG at the bottom, as shown in the accompanying image.
LPG is generally stored, as a liquid, in steel vessels ranging from small BBQ gas bottles to larger gas cylinders and storage tanks.
Almost all of the uses for LPG involve the use of the gas vapour, not the liquefied gas