An instrument that measures atmospheric pressure, used in weather forecasting and altitude determination.
From Greek baros 'weight' + metron 'measure', coined in the 17th century when Evangelista Torricelli invented the device. The term was formed following the pattern of other scientific instruments ending in '-meter'.
The barometer was revolutionary because it proved that air has weight and pressure - concepts that seem obvious now but were groundbreaking in the 1600s. Beyond weather prediction, 'barometer' has become a powerful metaphor for any indicator of changing conditions, as in 'barometer of public opinion' or 'economic barometer'.
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