Friday, January 9, 2009

Simple Manometers: Piezometer

Simple Manometers
A simple manometer is one which consists of a glass tube, whose one end is connected to a point where pressure is to be measured and the other end is open to atmosphere.

Piezometer is one of the simplest forms of manometers. It can be used for measuring moderate pressures of liquids. The setup of piezometer consists of a glass tube, inserted in the wall of a vessel or of a pipe. The tube extends vertically upward to such a height that liquid can freely rise in it without overflowing. The pressure at any point in the liquid is indicated by the height of the liquid in the tube above that point.

Piezometer, Simplest form of manometer

Pressure at point A can be computed by measuring the height to which the liquid rises in the glass tube. The pressure at point A is given by p = wh, where w is the specific weight of the liquid

Limitations of Piezometer
1. Piezometers can measure gauge pressures only. It is not suitable for measuring negative pressures.

2. Piezometers cannot be employed when large pressures in the lighter liquids are to be measured since this would require very long tubes, which cannot be handled conveniently.

3. Gas pressures cannot be measured with piezometers, because a gas forms no free surface.


  1. nice ,cool.......!!

  2. nice information.....

  3. what can be the maximum diameter of piezometer

  4. Thanks for the info. =)

  5. right info @ right time :D

  6. can this piezometer be used for measuring porewater pressure in soil? does anyone know where i can find that information about porewater pressure measruing piezometers?

  7. what type of liqiud is used in this?

  8. thanks for information

  9. for civil engineers what is the use of learning fluid mechanics???????????????
    plz help me..............

  10. what is the maximum gauge pressure of water that can be measured by a piezometer of height 1.5 m ? and if liquid had a relative density of 8.5 what would the maximum measurable gauge pressure?

    1. Use the formula p = wh to calculate the maximum measurable pressures. Since you know the values of w & h, it can be easily calculated.

  11. it is awesome and i suggest u to give more information about piezo meter,u-tube manometer,single column manometer

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  17. what is the diameter of the tube? is it equal to pipeline dia?

  18. why we use mercury instead of water in piezometer?