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LPG exists as a gas at normal
atmospheric pressure, only existing in a liquid form at very
low temperatures or under pressure. When the pressure is released(
when the gas supply valve is turned on), the liquid will boil
and form a vapour. It is this vapour(gas) which is used to fuel
appliances.
Heat is needed to convert the liquid to gas, known as the latent
heat of vapourisation. As the liquid boils, it takes heat energy
from itself and its surroundings. This is why the containers
feel cold to the touch and if there is heavy gas consumption,
frost may appear on the outside.
Pressure increases with temperatures, so if the temperature
around the tank increases, so will the pressure inside the tank
as the liquid expands. Tanks are normally fitted with a pressure
relief valve to release any extreme pressure build up safely.
Propane and Butane are normally stored in either portable steel
cylinders or small bulk fixed storage tanks ready for use.
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