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Glossary of watchmaking

Atm (atmosphere)

ATM (Atmosphère) | 気圧(atm)/キアツ(アトム) | 物理大气压(atm)-大气

Unit of measure to indicate a watch's water-resistance, specifically its capacity to resist pressure, based on standard atmospheric pressure defined as 101.325 kilopascals (kPa) equivalent to approximately 1 bar.

Can be expressed in different ways: 10 atm = 10 bars = 100 metres