(petrochemistry) A poisonous manufactured gas, supplied to domestic consumers for heating, cooking and (formerly) lighting; it is a mixture of carbon monoxide and hydrogen formed by the reaction of coke with steam - C + H₂O => CO + H₂.

(US, slang) hydrogen cyanide, used in the gas chamber

(physics) a universal constant, R, that appears in the ideal gas law, PV=nRT, derived from two fundamental constants, the Boltzmann constant and Avogadro's number, R=N_Ak.

(chiefly Britain) Any of the measurements on a scale of temperatures in domestic gas cookers.

(euphemistic) to flatulate

(chemistry) a crystalline compound having an isometric ice lattice containing cages that incorporate small guest gas molecules; they are stable at moderate pressure and low temperature

a gas hydrate

(physics) a hypothetical gas, whose molecules exhibit no interaction, and undergo elastic collision with each other and with the walls of the container

A covering for the face with a filter to protect the user from poison gas.

(Canada, US) A device at a gas station that dispenses gasoline.