The science, practice, or art of measuring atmospheric pressure using barometers.
From barometer + -metry (Greek metria 'measurement'). Like geometry and astronomy, -metry denotes a field of measurement or study that emerged as scientific instruments became more precise.
Barometry seems like a narrow specialty, but it revolutionized science because measuring air pressure let meteorologists understand weather systems and climatologists recognize long-term climate patterns—one simple measurement opened entire fields of knowledge.
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