About

In the domain of scientific research and HVAC engineering, strict adherence to SI (International System of Units) is required. While atmospheric pressure is an intuitive unit for weather and diving, equations in fluid dynamics and thermodynamics almost exclusively require pressure in Pascals (Pa). Using non-SI units in formulas like the Ideal Gas Law often leads to dimensional inconsistency and calculation failure.

This tool performs the necessary multiplication to convert standard atmospheres into Pascals. Since the Pascal is a very small unit (representing one Newton per square meter), the resulting numbers can be unwieldy. This calculator intelligently formats the output, providing alternatives in kilopascals (kPa) or megapascals (MPa) to assist engineers in quick data logging and documentation.

Formulas

The standard atmosphere is defined as exactly:

1 atm = 101,325 Pa

To convert from Atmospheres to Pascals:

P_(Pa) = P_(atm) × 101,325

Common SI prefixes:

1 kPa = 1,000 Pa
1 MPa = 1,000,000 Pa

Reference Data

Pressure (atm)	Pressure (Pa)	Pressure (kPa)
0.01 atm	1,013.25 Pa	1.01 kPa
0.5 atm	50,662.5 Pa	50.66 kPa
1 atm	101,325 Pa	101.33 kPa
2 atm	202,650 Pa	202.65 kPa
5 atm	506,625 Pa	506.63 kPa
10 atm	1,013,250 Pa	1.01 MPa

Frequently Asked Questions

A Pascal is defined as one Newton of force spread over one square meter (1 N/m²). This is a very gentle pressure (approx equal to the weight of a dollar bill on a table). An Atmosphere represents the weight of the entire column of air above sea level, which is why 1 atm equals over 100,000 Pascals.

Standard atmospheric pressure is 101.325 kPa.

This tool prevents negative input validation because absolute pressure cannot be negative in a physical vacuum context. However, for gauge pressure differentials, the math remains linear.