The bar equals 100,000 pascals โ slightly less than one atmosphere (1.01325 bar). It is a convenient unit for everyday pressures: tyre pressures, diving depth, weather fronts. Common in European engineering.
Real-world: Car tyre: 2.0โ2.5 bar. SCUBA at 10 m depth: 2 bar absolute. Fire hose: 5โ7 bar.
Read full bar reference โThe megapascal equals 1,000,000 pascals or 10 bar. Used for high-pressure engineering โ hydraulic systems, material strength, concrete compression tests. 1 MPa is roughly the pressure of a 100-tonne weight on 1 mยฒ.
Real-world: Concrete compressive strength: 20โ60 MPa. Hydraulic press: 30โ70 MPa. Steel yield strength: 250+ MPa.
Read full megapascal reference โ