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gas mask

(Encyclopedia)gas mask, face covering or device used to protect the wearer from injurious gases and other noxious materials by filtering and purifying inhaled air. In addition to military use (see chemical warfare)...

gas tube

(Encyclopedia)gas tube: see electron tube.

natural gas

(Encyclopedia)natural gas, natural mixture of gaseous hydrocarbons found issuing from the ground or obtained from specially driven wells. The composition of natural gas varies in different localities. Its chief com...

mustard gas

(Encyclopedia)mustard gas, chemical compound used as a poison gas in World War I. The burning sensation it causes on contact with the skin is similar to that caused by oil from black mustard seeds. The compound is ...

noble gas

(Encyclopedia)noble gas: see inert gas.

oil gas

(Encyclopedia)oil gas, any of a group of fuel gases produced from oil by exposing it to high temperatures. High-Btu oil gas is so called because of its high heating value; it is often used to supplement natural gas...

marsh gas

(Encyclopedia)marsh gas: see methane.

laughing gas

(Encyclopedia)laughing gas: see nitrous oxide. ...

water gas

(Encyclopedia)water gas, colorless poisonous gas that burns with an intensely hot, bluish (nearly colorless) flame. The gas is a mixture of carbon monoxide and hydrogen with very small amounts of other gases, e.g.,...

blister gas

(Encyclopedia)blister gas: see poison gas.