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You can prove Pascal's law with this practical experiment using equipment that you can easily acquire.
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Equipment:
A "kinder surprise egg", a syringe, a hypodermic needle and a sharp nail.
If you have a gas burner you can heat the nail, taking care not to burn yourself as metal is a very good conductor of heat.
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Make a hole with the hot nail in the two
opposite ends of the egg and a bigger one in the middle of the side to
insert the syringe. Fill the syringe with coloured water and press
down.
You will see the water flow out at the same speed from the two ends (the jet covers the same distance).
If we did not know Pascal's law we would
perhaps have supposed that the jet on the left would have been faster
as it is flowing in the direction in which the bulb of the syringe is
moving.
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