Match the following. A B C Atmospheric pressure pascal coconut oil Lubricant attraction barometer Coconut falling down bar thermometer Magnet friction noncontact gravitation repulsion

Atmospheric pressure is the pressure exerted by the air. The weight of the air column over a unit area of the earth's surface is called atmospheric pressure. The magnitude of this pressure near the surface is greater and decreases as we go up. It is usually measured using a barometer and is normally measured in bar . Friction is a force that resists the relative motion of a body over another body in contact. Sometimes to reduce friction, certain materials like ball bearings and lubricants have to be used for smooth motion. Coconut oil is one such lubricant that helps to overcome frictional force. Any object when thrown upwards always falls towards the earth. This is because of gravitation which is a non-contact force, where there occurs a force of attraction between two masses. The earth exerts this force on every object towards it. The magnet has two poles, a north pole and a south pole. Thus, in magnet unlike poles undergo and like poles repel each other.

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Water is not used as the liquid in barometers because :

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Important Questions on Fluids

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Science>Physics>Fluids>Atmospheric Pressure

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tube with both ends open to the atmosphere is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of