We have two barometers. One barometer contains mercury and second water. Which one will register more pressure? (Neglect the surface tension effect).
Mercury barometer will register more pressure than water barometer. This is because of the following reasons:
i) Mercury is around 14 times heavier than water i.e., it is denser than water.
ii) The vapour pressure of mercury is low as compared to that of water. So, mercury will be more sensitive to changes in the atmospheric pressure and rises more quickly to record the changes in the atmospheric pressure.
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