An assorted bundle of gas<unk>  at Duke University Butane gas cylinder A line of liquefied petroleum gas cylinders on a street in Kathmandu, Nepal<unk>  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<unk>  known as gas cylinders.
Bottled gas
Tear gas
Breathing gas
Sputum
Blood gas tension
Oxygen saturation
Oxygen saturation 
Mustard gas