A recorded chart showing three simultaneous measurements: atmospheric pressure, temperature, and humidity.
From Greek 'baros' (pressure) + 'thermo' (heat) + 'hygro' (moisture) + '-gram' (recorded). This compound term emerged in 20th-century meteorology as instruments became sophisticated enough for triple measurements.
Meteorologists love these triple-measurement charts because pressure, temperature, and humidity together tell the complete story of what the atmosphere is doing—they're like three threads in a rope that when woven together reveal whether a storm is coming.
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