Pascal's law class 9 physics | 9th class physics ch 7 pascals law | all noards | atifahmadofficial

PASCAL'S LAW
An external force applied on the surface of a
liquid increases the liquid pressure at the surface of the
liquid. This increase in liquid pressure is transmitted
equally in all directions and to the walls of the container
in which it is filled. This result is called Pascal's law which
is stated as:
Pressure, applied at any point of a liquid
enclosed in a container, is transmitted without
loss to all other parts of the liquid.
It can be demonstrated with the help of a glass
vessel having holes all over its surface as shown in
figure 7.14. Fill it with water. Push the piston. The water
rushes out of the holes in the vessel with the same
pressure. The force applied on the piston exerts
pressure on water. This pressure is transmitted equally
throughout the liquid in all directions.
In general, this law holds good for fluids both for
liquids as well as gases.
APPLICATIONS OF PASCAL'S LAW
Pascal's law finds numerous applications in our
daily life such as automobiles, hydraulic brake system,
hydraulic jack, hydraulic press and other hydraulic
machine such as shown in figure 7.15.
HYDRAULIC PRESS
Hydraulic press is a machine which works on
Pascal's law. It consists of two cylinders of different

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