Pascalís law of transmission of pressure in fluids Pascalís law is a useful application and extension of the phenomena of liquids seeking their levels automatically. Take a vessel that has many limbs and an airtight piston at the centre.
Procedure:
1. Fill the vessel with liquid.
2.Press the piston, you will notice that the liquid level has risen in the other limbs equally. This implies that the pressure applied on the piston is transmitted immediately in other parts of the liquid.
--Remember that an increase in height means increase in pressure. (It is important to note that the liquid has to be a non-compressible fluid. The same will not be applicable to gases.)
Pascalís Law states that pressure exerted at a point in an enclosed (and non-compressible) liquid is transmitted equally in all directions. The pressure is transmitted undiminished.
EXPERIMENT 2
Applications of Pascalís law are plenty. The most common use this has is in hydraulic lifts, car brakes etc. How this is achieved is shown in the diagram below.
Procedure
1. Two cylinders are connected in an airtight fashion.
2. The arrangement is filled with liquid. The piston 1 in one cylinder is smaller than piston 2 in other cylinder.
3. On the smaller piston, a load (force) of W1 is applied.
Now you can appreciate how car breaks function. The break system is filled with special break fluid. A small pressure break paddle is able to stop a moving car which has such a large mass than the break paddle itself!
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