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Pressure is force per unit area (P = F/A). The SI unit is the pascal (Pa = N/m²). Common units include atmospheres (atm), bar, PSI (pounds per square inch), mmHg (torr), and kPa. Pressure is used in weather, diving, tire pressure, and fluid dynamics.

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1. 11 atmosphere (atm) = 101,325 Pa = 14.696 PSI = 760 mmHg = 1.01325 bar
2. 21 bar = 100,000 Pa (close to 1 atm)
3. 31 PSI = 6,894.76 Pa
4. 41 mmHg = 133.322 Pa (blood pressure unit)

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