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Liquid Pressure

All liquids and gases are fluids. A solid exerts pressure on the surface due to its weight. Similarly, fluids have weight and they also exert pressure on the base and walls of the container in which they are enclosed. Pressure exerted in any confined mass of fluid is transmitted undiminished in all directions. Other important properties of liquids are
  • Pressure increases with depth.
  • Pressure is the same at all points at the same depth.
  • Liquid seeks its own level.

Activity 1
Take a tall vessel.
Drill four small holes at different depths.
Fill the vessel with water to the brim.
Now remove the strip of tape.

 


You will find that water rushes out with great force from the hole at the bottom, with less force from the hole at the centre and with least force from the hole on the top. This shows that pressure increases with depth.


Activity 2
 


Perform a similar experiment as in the above activity with holes made at the same height on the metal can. Observe what happens. You will find that water rushes out with equal force from all the holes. This proves that pressure is the same at all points at the same depth.

 


 




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