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.

• Bi-directional -20 to +100 Pa clean room air diff pressure transmitter
• 200 kPa g range 4-20mA output freshwater pressure sensor for water treatment use
• 1000 kPa g range natural gas 4-20mA output pressure sensor and switch
• 0 to -2000 Pa vacuum transmitter

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Conversion Factors

• 0.00001 bar
• 0.0001450377 psi
• 0.01 mbar
• 1 N/m²
• 1 Pa
• 0.01 hPa
• 0.001 kPa
• 0.000001 MPa
• 0.0000101972 kg/cm²
• 0.101972 mmH2O 4°C (39.2°F)
• 0.0101972 cmH2O 4°C (39.2°F)
• 0.000101972 mH2O 4°C (39.2°F)
• 0.00401463 inH2O 4°C (39.2°F)
• 0.000334553 ftH2O 4°C (39.2°F)
• 0.00750062 mmHg 0°C (32°F)
• 0.000750062 cmHg 0°C (32°F)
• 0.000295300 inHg 0°C (32°F)
• 0.00750062 Torr
• 7.50062 mTorr
• 0.00000986923 atm
• 0.0000101972 at
• 10 dyn/cm²
• 0.00232060 oz/in²
• 7.50062 µHg 0°C (32°F)
• 0.0000000647490 tsi (uk, long)
• 0.0000000725189 tsi (usa, short)
• 0.0000104427 tsf (usa, short)
• 0.0208854 psf
• 0.0101972 g/cm²

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

Conversion Tables

Select a look up table for converting a pressure reading in pascals to other measurement units.

• psi  »  100 to 100,000 Pa → 0.0145038 to 14.5038 psi
• bar  »  100 to 200,000 Pa → 0.001 to 2.000 psi
• mmH₂O  »  1 to 1000 Pa → 0.101972 to 101.972 mmH₂O
• inH₂O  »  1 to 1000 Pa → 0.00401463 to 4.01463 inH₂O
• mmHg  »  1 to 1000 Pa → 0.00750062 to 7.50062 mmHg
• Torr  »  1 to 1,000 Pa → 0.00750062 to 7.50062 Torr

• Digital sensor for leakage monitoring at 1 kilopascal on a PC
• 15,000 Pa DP Transmitter with built-in digital display
• Low range ATEX approved 100 Pascal range DP transmitter
• 20,000 kilopascal portable pressure calibrator

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Help

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.

• Minus 100 pascal suction pressure transmitter
• 20,000 kilopascal portable pressure calibrator
• 800 kPa g range 4-20mA output freshwater pressure sensor for agricultural pump use
• 15,000 Pa DP Transmitter with built-in digital display

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Measurement Unit Related Terms

More pages related to measurement unit technical terms.

• at – Technical Atmosphere Pressure Unit
• atm – Standard Atmosphere Pressure Unit
• bar Pressure Unit
• cmH2O – Centimetres of Water Column at 4 deg C Pressure Unit
• cmHg – Centimetres of Mercury at 0 deg C Pressure Unit
• daPa – Dekapascal Pressure Unit
• dyn/cm² – Dyne per Square Centimetre Pressure Unit
• ftH2O – Feet of Water Column at 4 deg C Pressure Unit
• g – Acceleration due to Gravity
• g/cm² – Grams per Square Centimetre Pressure Unit
• hPa – Hectopascal Pressure Unit
• inH2O – Inches of Water Column at 4 deg C Pressure Unit
• inHg – Inches of Mercury at 0 degrees C Pressure Unit
• kg/cm² – Kilogram per Square Centimetre Pressure Unit
• kg/mm² – Kilogram per Square Millimetre Pressure Unit
• kPa – Kilopascal Pressure Unit
• ksi – Kilopounds per Square Inch Pressure Unit
• mbar – Millibar Pressure Unit
• mH2O – Metres of Water Gauge at 4 deg C Pressure Unit
• mmH2O – Millimetres of Water Column at 4 deg C Pressure Unit
• mmHg – Millimetres of Mercury at 0 deg C Pressure Unit
• MPa – Megapascal Pressure Unit
• mPa – Millipascal Pressure Unit
• mTorr – Millitorr Pressure Unit
• N/cm² – Newton per Square Centimetre Pressure Unit
• N/m2 – Newton per Square Metre Pressure Unit
• N/mm² – Newton per Square Millimetre Pressure Unit
• oz/in² – Ounce per Square Inch Pressure Unit
• Pressure
• Pressure Units
• psf – Pounds per Square Foot Pressure Unit
• psi – Pounds per Square Inch Pressure Unit
• Specific Gravity
• Torr Pressure Unit
• tsf – Tons per Square Foot (USA, Short) Pressure Unit
• tsi – Tons per Square Inch (UK, Long) Pressure Unit
• tsi – Tons per Square Inch (USA, Short) Pressure Unit
• Water Density
• µHg – Micron of Mercury at 0 deg C Pressure Unit