A device which mixes air with a substance, particularly soil or a liquid.
A fumigator used to bleach grain, destroying fungi and insects.
A device used for charging mineral waters with gas and in making soda water.
A device that circulates fresh air and expels stale or noxious air.
A machine that moves breathable air into and out of the lungs of a patient who is unable to breathe sufficiently.
Some behaviour or happening that relieves a tense atmosphere or situation.