An instrument designed to measure the density, weight, or pressure of air, or to test air quality.
From 'air' + '-meter' (Greek 'metron,' meaning 'measure'). Created as a compound during the 18th-19th centuries when scientists were developing instruments to quantify atmospheric properties.
Early airometers were crucial for understanding that air had weight and could be measured—before these instruments, many people didn't believe air was a physical substance at all, thinking it was just 'nothing,' so proving it could be weighed was scientifically revolutionary!
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