Hydraulics Demo
A good way of demonstrating the basic principles of hydraulics is to join two syringes together with rubber tubing to make an watertight seal.[see figure 1]The syringes can be filled with water, oil, or just air. Pushing plunger A causes plunger B to move out and pushing plunger B in causes plunger A to move out. This works even if the syringes are not in the same plane. i.e. if the tubing is bent by 90° as long as there is no kink in the tube that prevents the free flow of fluid.
By adjusting the size of the syringes it is possible to demonstrate how to multiply force [see figure 2]. A small mass on a small syringe can lift a much larger mass if it is resting on a bigger syringe. This is because the pressure in the two syringes is equal, but the surface areas of the two pistons are different, and force = pressure × area.
See Also
School science experiment -- Pneumatics demo[?]bungalows with their red-tiled roofs, are dotted about along the
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the shore that her yards overhang it, which enables stores and
about seventy feet above the level of the galle face (the
across this flat plain on one side and the sea.html">sea on the other.
a desirable residence for those who delight in a temperature of
great enjoyment, but the pleasure in such a country is destroyed
and crocodiles in the rivers and tanks; thus a man is nothing
Accidents necessarily must happen, but they are not so frequent
monsters that exist. Still, I am convinced that a white.html">white.html">white man
being bright and easily distinguished in the water. Thus in
impunity it would be most dangerous for a white man to enter.
There was a lamentable instance of this some few years ago at
where the natives were always in the habit of bathing, a party of
afternoon for a swim. It was a lovely spot for bathing; the
out to sea served as a breakwater to the heavy surf, and
lot of English soldiers stripped to bathe; and although the ruddy
climate of the East, nevertheless their spirits were as high as
circumstances. However, one after the other took a run, and then
the long line of bathers was a fine lad of fifteen, the son of
his age he ranked himself among the men.html">men, and on arriving at the
crowd of men were on the margin watching the bathing; the boy.html">boy
the water from his hair, a cloudy shadow seemed to rise from the
large shark was visible as his white belly flashed below. At the
crimsoned, and a bloody foam rose to the surface - the boy was
.
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