1) Barbecue fuel 
Bottled gas is a term used for substances which are gaseous at standard temperature and pressure (STP) and have been compressed and stored in carbon steel, stainless steel, aluminum, or composite bottles known as gas cylinders. ==Gas state in cylinders== There are four cases: either the substance remains a gas at standard temperature but increased...
A generic term for liquefied and pressurized gas, ordinarily butane, propane, or a mixture of the two, contained in a cylinder for domestic use.
gas stored in portable cylinders under pressure. · See