Pressure and it’s measurement by manometer

  • Pressure = Force/Area
  • SI unit is Pascal
  • 1Pa = 1N/m-2
  • It is the simplest method of pressure meosurement
  • lt does not need calibration
  • So it can be used to calibrate other devices
  • The pressure is balanced against a column of liquid of known density – usually water for low pressures and mercury for higher pressures
  • The pressure is equal to the depth multiplied by the liquid density multiplied by the acceleration due to gravity; hence the commonly used units cm of H2O and mm of Hg
  • Mercury is 13 times more dense than water
  • The vertical height gives the pressure value
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