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Rev. Notes > IGCSE > Pressure
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Pressure Atmospheric pressure Pressure in case of liquid
Mercury barometer Manometer


Manometers are used to measure the pressure difference between two regions.

It consists of a tube of plastic or glass, bent into the U-shape and filled with a liquid that is often oil.

If there is a pressure difference between the ends of the manometer, the liquid moves until the pressure difference is balanced by the difference in heights of the ends of the liquid.

The greater the pressure the greater the difference in heights.

Oil is often used rather than water because water evaporates and also oil is less dense which makes the manometer more sensitive.

Pressure difference between two regions is given by

ΔP=d X g X Δh

This is basically the same equation as P=d X g X h

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View Comments on this Chapter - Total Comments (6)
Amaan Said :
Insufficient information
  26/11/15 01:23 PM
Uwase Sandrine Said :
A picture could help with again more details
  23/01/15 07:58 AM
Uwase Sandrine Said :
it would be good if it was detailed with a few examples and more explanation but thankx anyway saved my life
  23/01/15 07:49 AM
abdirahman Said :
i really need more details on pressure!!
  03/05/12 08:17 AM
Zoyaa Said :
Yeah good explanation but i need more in detail. Anyways Thank You :)
------------------------------------------------------------------------------------- Admin Replied:

Thanks Zoyaa, for your comments. We will try to add more details very soon.

  09/04/12 06:17 PM
Zeenat Said :
Good understanding of pressure, but it will be good if few more examples are there.
------------------------------------------------------------------------------------- Admin Replied:

Thank you for your comment. We are trying our best to make it possible.

  20/12/11 09:42 AM


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