About Pressure
Pressure is force applied per unit area. The pascal (Pa) is the SI base unit. Common units include bar, psi (pounds per square inch), and atmosphere (atm).
Standard atmospheric pressure at sea level is exactly 1 atm = 101,325 Pa = 14.696 psi.
Pro Tips
Tire pressure is usually expressed in psi (US) or bar (EU) — 30 psi ≈ 2.07 bar.
Blood pressure readings use mmHg — normal is around 120/80 mmHg.