what is atmospheric pressure?explain it by experiment
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The air inside a balloon is under pressure as it is squeezed by the rubber. When you place the inflated balloon on top of the bottle, the air pressure on top of the bottle becomes higher. That pushes down on the water in the bottle, pushing it through the straw and making the fountain stronger.
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That pressure is called atmospheric pressure, or air pressure. It is the force exerted on a surface by the air above it as gravity pulls it to Earth. Atmospheric pressure is commonly measured with a barometer. In a barometer, a column of mercury in a glass tube rises or falls as the weight of the atmosphere changes.
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