Why is water not used in a barometer liquid ? Give two reasons
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Water is not a suitable barometric liquid because: (i) The vapour pressure of water is high, so its vapours in the vacuum space will make the reading inaccurate. (ii) Water sticks with the glass tube and wets it, so the reading becomes inaccurate.
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Cause the expansion of water is more than mercury or any other element used also the density, also temperature factor makes more important if anything measures or has more value it will collapse or break the glass where as mercury won't.. the value of water is 13 times more than mercury it means you will require 13 meter long instrument to measure it
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