Atmospheres to Pascals

An atmosphere (atm) is a standard unit for pressure based on average air pressure at sea level, and 1 atm is defined exactly as 101,325 pascals. This formula converts a pressure written in atmospheres into the SI unit pascals by multiplying by that fixed conversion factor. It works because both units measure the same physical quantity—pressure—just on different scales.

Use this when solving physics, chemistry, or engineering problems that give pressure in atmospheres but require SI units in pascals. It is especially common when working with gases, fluid pressure, weather-related calculations, or lab measurements.

• multiplying by 101.325 instead of 101325
• forgetting that the answer should be in pascals, not atmospheres
• rounding too early and losing accuracy