(physics) The branch of fluid mechanics that deals with the action of forces on gases.

The gaseous combustion product (smoke) that comes out of a stove or a furnace.

(euphemistic) to flatulate

a gas hydrate

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

(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

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

Used other than figuratively or idiomatically: see out of, gas.: lacking fuel. / (Canada, US, idiomatic) Tired; lacking energy or motivation.

(chemistry) A gas which does not undergo chemical reactions. / (chemistry, specifically) A noble gas.

(chemistry) Any of the elements of group 18 of the periodic table, being monatomic and (with very limited exceptions) inert.