Question

explain the working of barometer​

Answer 1

Photo: A Torricellian barometer (sometimes called a mercury barometer) is an inverted (upside-down) glass tube standing in a bath of mercury. 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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Answer 2

The working of barometer

To measure the atmospheric pressure, a long glass tube filled with mercury is dipped into a trough containing Mercury . This glass tube, which is about 100 cm long , is closed from the top and open at the lower end, dipped in the trough . The Mercury flows from the tube to the trough . A small vacuum gets created at the top of the glass tube . The vacuum gets created because of the balance between the atmospheric pressure outside the tube and the water pressure inside the tube . The water level decreases until the levels of pressure outside the column and inside the column are the same. The length of the column is equal to the pressure exerted by air .