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24 April, 13:29

A decrease in height of a column in a mercury barometer means that

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  1. 24 April, 13:39
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    A decrease in height of a column in a mercury barometer means that the air pressure is decreasing. Barometer is a device used to measure atmospheric pressure and also it may be used to measure altitude since atmospheric pressure changes with distances above sea level. Air pressure pushes down on the surface of the mercury, making some rise up the tube, the greater the air pressure, the higher the mercury rises.
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