Atmospheres to Pascals

An atmosphere (atm) is a standard unit used to describe pressure, based roughly on the average air pressure at sea level on Earth. To convert atmospheres to pascals, you multiply by 101325 because 1 atm is defined exactly as 101325 Pa in the SI system. This works as a fixed conversion factor, so the pressure changes by the same scale in every calculation.

Use this conversion in physics, chemistry, and engineering whenever pressure is given in atmospheres but needs to be expressed in SI units. It is especially common in gas law problems, fluid pressure calculations, and laboratory measurements.

• Multiplying by 100000 instead of 101325
• Forgetting to include the unit pascals in the final answer
• Using the formula backwards when converting from pascals to atmospheres