A device that measures the volume of gas or stores gas for use, often used in laboratory settings or industrial applications.
From gas (coined by Jan Baptist van Helmont in 1662 from Flemish 'chaos') combined with -meter (from Greek metron 'measure'). The term emerged in the 18th century as gas chemistry developed.
Gasometers were crucial to the birth of chemistry—scientists needed ways to measure mysterious invisible gases, and these instruments helped prove that air itself wasn't one simple substance but many different gases mixed together.
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