Propane Facts - Free Gas Co. Ltd.

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Propane is a three-carbon alkane – its molecular formula is C3H8.
Propane is an odourless gas to which an odourant has been added to detect leaks.
Liquid propane boils (from liquid to vapour) at -44F (-42.2C).
At one and a half times the weight of air, propane gas will settle in low areas.
In a liquid form, propane is half the weight of water.
About 23.5 cubic feet of air is required to burn one cubic foot of propane.