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The unit of pressure is
1. N/m2 
2. Torr
3. psi
4. All of the above

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Correct Answer - Option 4 : All of the above

Explanation:

Pressure: The pressure is the force exerted perpendicular to the surface of an object per unit area over which the force is spread.

  • The pascal (Pa) or N/m2 is the SI unit of pressure. 
  • The pound-force per square inch ( psi) is the standard pressure unit in imperial and US customary systems or in FPS System.
  • kg/ms2 is the SI based unit of Pressure.
  • Pressure may also be expressed in relation to standard atmospheric pressure as atm.
  • The torr is another unit of pressure specified as \(\frac{1}{760}\) of 1 atm.
  • Manometric units, such as the centimetre of salt, the millimetre of mercury, and the inch of mercury, are used to describe pressures in terms of the height of the column of a given fluid in the manometer.

MKS unit system:

  • In this system, the length is measured in meter (m), mass is measured in kilogram (kg) and time is measured in second (s).
  • For example SI unit of velocity is m/s.

CGS unit system:

  • In this system, length is measured in centimeter (cm), mass is measured in gram (g) and time is taken in second (s).
  • For example CGS unit of density is g/cm3.

FPS unit system;

  • In this system, length is measured in foot, mass is measured in pound and time is measured in second (s).
  • For example: FPS unit of volume is foot3.

  • Manometric units, such as the centimeter of salt, the millimeter of mercury, and the inch of mercury, are used to describe pressures in terms of the height of the column of a given fluid in the manometer.
  • Some other quantities of pressure and their conversions

Units of pressure

Pa

bar

atm

Torr

1 Pa

1

10-5

9.87× 10-6

7.5× 10-3

1 bar

105

1

0.987

750.06

1Torr

133.32

1.33× 10-3

1.32× 10-3

1

1 atm

1.013× 105

1.013

1

760

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