Pa – Pascal Pressure Unit

Pascal is the SI unit for pressure and is derived from other SI units using the following relationship: Pa = (kg.m/s²)/m² = kg/m.s² = N/m².

Since 1 pascal is a very low pressure being 1/100 of a millibar, it’s use is limited to ultra low gas pressure applications such as measuring the pressure differences in ventilation systems.

The pascal is more commonly used as larger multiples of the unit which are the hectopascal (hPa), kilopascal (kPa) and the megapascal (MPa) unit, these are more practical when measuring mid range pressures.

Unlike other units such as psi, kgf/cm2, mH2O and inHg the pressure value that the pascal unit represents is unchanging no matter where and how it is used. The pascal unit is completely independent of ambient temperature, local gravity and media density.

To determine the equivalent value of a pascal measurement in other units you can multiply it by the choices displayed in the table below.

To convert multiple values from or to pascals please use the online conversion tool for pressure.

Pa Pressure Conversion Factors

Please note that the conversion factors above are accurate to 6 significant figures.

Pa Help

Do you have a question about the Pascal pressure unit?

Vacuum level of 5 Pa

Can you tell me in laymen terms, how much vacuum equals 5 Pa?

All pressures below atmospheric pressure are considered vacuum. 101,325 Pa is 1 standard atmosphere. Therefore 5 Pa would be ~ 0.005% of atmosphere, so small in comparison to the total vacuum range.

However vacuum can be referenced to atmospheric pressure or a perfect vacuum. So 5 Pa below atmospheric pressure (-5 Pa gauge) would be a very slight suction pressure, but if it is 5 Pa above a perfect vacuum (5 Pa absolute) it would be a strong vacuum at the opposite end of the vacuum scale.

What is the relationship between Pascal, bar and Newton per meter squared?

Pascal relationship to N/m² & bar

The Pascal pressure unit is actually the SI unit derived from 1 Newton per Square Metre. The bar pressure unit is exactly equal to 100,000 Pascals or N/m2

  • 1 N/m2 = 1 Pa
  • 1 bar = 100,000 Pa

SI unit for pressure

What is the SI unit of measurement for pressure?

The SI units for pressure are Pascals. Since pressure is derived from the force acting on a unit area, Pascals are derived from the SI units for Force and Area which are Newtons and Metres respectively.

Pressure = Force / Area = Newton per Square Metre (N/m2) = Pascal (Pa)

KpH wind speed to Pascal pressure conversion

How do you convert a wind speed in Kph to a pressure in Pascal?

This page explains how to convert wind speed to pressure, and you can use this tool to convert wind speed to pressure values.


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