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

Mercury barometer

It is used to measure atmospheric pressure.

It is made up of a glass tube sealed at the top. It contains mercury and the opened base of the tube dips into a beaker and below the surface of the mercury in the beaker.

Atmospheric pressure pushes down the mercury in the beaker which pushes the mercury up the inside the tube.

In the space above the mercury in the tube is a vacum, so nothing is pushing down the top of the mercury in the tube and atmospheric pressure will push the mercury up until the pressure of the column of mercury balances the atmospheric pressure.

The height “h” is approximately 760mm or 76cm of mercury.

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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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