The Principle of Hydraulic Jacks
The principle of hydraulic jacks is that if you apply force to a non-compressing liquid, it can raise a larger weight. How much weight you can raise depends on the amount of pressure the liquid is under. If you had a teakettle with a spout 1 square inch in diameter, and you put a plunger in the spout, and put a piston instead of the lid, and you had 10 square inches of water inside, if you put 10 pounds of pressure on the plunger, you could raise 100 pounds!! Each square inch of water is putting 10 pounds of pressure on the piston, so you are applying a weight of 100 pounds to the piston! If the spout was only a quarter of a square inch, you could raise 400 pounds! Hydraulic jacks make it very easy to lift big heavy things.
A Hydraulic Jack
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