draw a well-labelled digeram of a Mercury barometer and explain why a barometer will show a greater reading when taken down a coal mine.
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14
Answer:
A barometer is an instrument which measures pressure. In the coal mine the pressure is high as compared to normal pressure. Thus, when Barometer is taken down in the coal mines, it shows greater reading.
refer the diagram below:-
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5
Answer:
because it is made by filling a long glass tube with mercury
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