Why dies a small quantity of air introduced into the top of
the barometer tube depress the level of mercury ?
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Answer / sanju
In a barometer there should be perfect vacuum above the
mercury level at the to of the glass tube. If air is
introduced into it, it will exert a downward pressure and
the mercury level will fall
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Answer / arun k s
The air introduced into the top of the barometer fills
evenly inside the barometer and excerts its pressure (which
further increases when the mercury colomn compresses the
air). Hence the inside mercury colomn get the assistance of
this air pressure to balance the outside atmospheric
pressure & the mercury level depresses.
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Answer / kavita saxena
In a barometer there should be perfect vacuume above the mercury level at the to of the glass tube. If air is introduced into it, it will exert a downward pressure and the mercury level will fall
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