The molecule above is propane. Its formula is C₃H₈, and its molecular weight is 44.09 amu. Its melting point is -187.1'C, its boiling point is -42.1'C, and its density is .524 at 0'C. Propane is found in natural gases, light crude oils, and formed when heavy oils are cracked to produce gasoline. Propane is normally a gas except when it is put under very high pressures. Then it forms a liquid. Propane is slightly soluble in water, in alcohol it is moderately soluble,and in ether it is very soluble. Propane is used as fuel in industry. It is used in commercial trucks, homes in isolated areas, portable cooking stoves, space heaters, small generator motors, water heaters, refrigorators, and air-conditioners. Propane is mainly used for domestic purposes in isolated areas. When it is in this form it is marketed as LPG. LPG is an engineers dream fuel. LPG is is compressed and cooled and put in high pressure bottles so it will liquify. Unlike other fuels LPG enters an engine as a gas and is very rapidly burned.