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That unit we often hear in weather forecasts

Symbol: Pa / Base data: pressure, stress. SI derived units.
1Pa = 1 newton/㎡

Expresses air pressure

Where have you heard the word, “hectopascal”, before? That’s right, in a weather forecast. “Hecto” means 100, and “pascal” is a unit that expresses pressure. In a weather forecast, it expresses air pressure. “Millibar” was used in the past, but it was changed from 1992 because it is not an SI unit.