Natural gas is widely used to supply energy for domestic use and for industrial processes. It was formesd millions of years ago by the same process that produced oil. Gas flows or is pumped by boreholes, often mixed with air and water. Then gas is separated and passes through a refinery. Some of its constituents, such as propane and butane, are removed and liquified so bthatn they can be pumped into cylinders and used as fuel. Liquified gases held under presure can be carried all around the world in specially constructed ships.
The remaining gas, which consist mainly of methane, is pumped along pipelines for domestic use. Methane has no smell, so a strong-smelling additive is used to make people aware of gas leaks.
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