Definition:Pressure/Unit
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Pressure: Units of Measurement
The SI unit of measurement of pressure is the pascal.
The CGS unit of measurement of pressure is the barye.
The FPS unit of measurement of pressure is the pound per square inch.
Pascal
The pascal is the SI unit of pressure.
It is defined as being:
- The amount of pressure required to apply a force of $1$ newton over an area of $1$ square metre
| \(\ds \) | \(\) | \(\ds 1\) | pascal | |||||||||||
| \(\ds \) | \(=\) | \(\ds 1\) | newton per square metre | |||||||||||
| \(\ds \) | \(=\) | \(\ds 10\) | barye (dynes per square centimetre) | |||||||||||
| \(\ds \) | \(=\) | \(\ds 10^{-6}\) | megapascal | |||||||||||
| \(\ds \) | \(\approx\) | \(\ds 1 \cdotp 450377 \times 10^{-4}\) | pounds per square inch | |||||||||||
| \(\ds \) | \(\approx\) | \(\ds 2 \cdotp 089 \times 10^{-2}\) | pounds per square foot | |||||||||||
| \(\ds \) | \(\approx\) | \(\ds 9 \cdotp 869 \times 10^{-6}\) | standard atmospheres |
Barye
The barye is the CGS unit of pressure.
It is defined as being:
- The amount of pressure required to apply a force of $1$ dyne over an area of $1$ square centimetre.
| \(\ds \) | \(\) | \(\ds 1\) | barye | |||||||||||
| \(\ds \) | \(=\) | \(\ds 1\) | dyne per square centimetre | |||||||||||
| \(\ds \) | \(=\) | \(\ds 10^{-1}\) | pascal | |||||||||||
| \(\ds \) | \(=\) | \(\ds 10^{-3}\) | millibars | |||||||||||
| \(\ds \) | \(\approx\) | \(\ds 1 \cdotp 450377 \times 10^{-5}\) | pounds per square inch |
Pound per Square Inch
The pound per square inch is an FPS unit of pressure.
It is defined as being:
- The amount of pressure required to apply a force of $1$ pound force over an area of $1$ square inch.
| \(\ds \) | \(\) | \(\ds 1\) | pound per square inch | |||||||||||
| \(\ds \) | \(\approx\) | \(\ds 0 \cdotp 07031\) | kilogram force per square centimetre | |||||||||||
| \(\ds \) | \(\approx\) | \(\ds 6895\) | pascals | |||||||||||
| \(\ds \) | \(\approx\) | \(\ds 5 \cdotp 171\) | centimetres of mercury | |||||||||||
| \(\ds \) | \(\approx\) | \(\ds 27 \cdotp 68\) | inches of water |