A specialized instrument that measures air pressure or gas pressure in the atmosphere or within a confined space.
From Greek aero- (air) + tono- (tension, pressure) + -meter (measuring device). The term combines technical Greek roots used in scientific instrument naming, developing in the 19th century as precision measurement tools became important.
Aerotonometers helped meteorologists first map atmospheric pressure patterns, discovering that invisible pressure differences in the air actually push weather systems around the planet—without them, we'd have no weather forecasting.
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