Fourth year of secondary education
Pressure (I)
E. Vallo - J.Villasuso
 Pressure
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Measuring pressure: manometers 1 / 3

A manometer is a device designed to measure the pressure in fluids. One that is frequently used is an open branch or U tube manometer, which consists of a U-shaped tube with one of the branches connected to the receptacle where the pressure is to be measured and the other open to the atmosphere.

The manometer in the visual is connected to a tube which is introduced into the liquid where we want to measure the pressure.
Its branches contain the same liquid, so that the difference between the branches is the same as the depth of the tube in the liquid.

When the liquid used in the manometer is mercury, the difference in the level in the branches would be 13.6 times less than the distance from the end of the tube to the surface.

To measure high pressure with mercury manometers the tubes do not have to be excessively tall.

 

What is pressure? How does it work?
Units
Hydrostatic pressure
Mathematical expression
The pressure increases the deeper you go in liquids
Which goes the furthest?
A little goes a long way!
Communicating vessels
Syphons
Pascal's Law
The Law
The hydraulic press
Hydraulic brakes: drum brakes
Manometers
Problems
Evaluation