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Webcatalog | Science teaching festival |
Under Pressure, Bernoulli's Right & Dipolar Waters I wish to demonstrate two experiments that are easy to perform. Under Pressure, Bernoulli's Right: I build the arrangement. I unscrew the valve and put the ping-pong ball into the funnel. The water starts flowing, but the ball stays in its place. Physical interpretation: At the place where the water flows out we observe a pressure drop (Bernoulli's right - dynamic pressure). The external pressure keeps the ball in the funnel. The ball doesn't fall. Dipolar Waters: I have the plastic bottle full of water, closed with a cork with only a small opening. I turn the bottle upside down, so that the water can start flowing. I rub the glass cane with a cotton cloth and move it closer to the jet of water. The cane obtain negative polarity properties. I then observe the deviation of the jet of water. Physical interpretation: The deviation of the jet of water is the result of polarization. The electrified cane produces a negative electric field. The electric field sets the dipoles of water. The induced field (through the dipoles of water) opposite to the electric field produced by the cane bends the jet of water.
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