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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.

Hướng dẫn từng bước

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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