Now these same eggheads mentioned earlier will tell you that in a tank of propane the gas is liquefied. But how can this be when propane is a gas at room temperature?
Well, the answer lies in the propane tank itself, where propane is held at a moderately high pressure of between about 5 and 10 atm. The picture at right shows the propane liquid as black and the propane gas above it as yellow. The yellow bubbles are also propane gas.
As a liquid, propane is much easier to store, with a liquid density (at the boiling point) of 582 kg per cubic meter as opposed to a gas density (at the boiling point) of 2.423 kg per cubic meter. This means the same mass of liquid would take up 240 times less space as the gas – meaning you get a lot more bang for each cubic meter!
interesting extra for the blog. adds some extra info on the use of the gas.
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