Other forms of gas

Two 45 kg LPG (Liquified petroleum gas) cylinders in New Zealand.
Source: Wikipedia

Besides natural gas, there are other forms of gas that are or have been used as energy sources.

Liquefied natural gas (LNG)

LNG is created by chilling natural gas to minus 160° centigrade. At this temperature the gas condenses into a liquid that is easier to handle and store. Special cylinders are used to store the liquid gas under high pressure for easy transportation.

Liquefied petroleum gas (LPG)

LPG is made of a mixture of propane and butane gases and is a by-product of oil and gas production. LPG is placed under pressure so that it turns into a liquid for easy storage in cylinders or tanks. When the pressure is released, the liquid turns back into a gas.

Town gas

No longer in widespread use, town gas, or coal gas, was made by baking coal in airtight ovens. The resulting gas bubbles were piped off and used for household lighting, heating and cooking as well as for street lighting. Natural gas is safer to use and has replaced town gas in Australia and many other countries.