The megapascal (MPa) equals one million pascals and is the standard unit for high-pressure applications in structural engineering, materials testing, and hydraulic systems. Concrete strength is rated in megapascals, and steel tensile strength specifications routinely reference this unit. One megapascal equals 10 bar or approximately 145 psi, bridging metric and imperial pressure scales.

The bar is a metric pressure unit equal to 100,000 pascals, widely used in meteorology, oceanography, and industrial applications because it closely approximates atmospheric pressure at sea level. Tire pressure gauges in Europe, scuba diving depth ratings, and weather maps all commonly reference bars or millibars. One bar equals approximately 0.9869 atmospheres or 14.504 psi.