How Do Mercury Barometers Work?

Answer

Mercury barometers work by measuring air pressure. They are constructed using a long glass tube, with a small reservoir at the bottom full of mercury. When the atmospheric pressure rises, more force is put to bear on the reservoir of mercury, which then forces the mercury to a higher level of the tube. Mercury barometers have millimetre markings along the length of their tubes to enable easy reading of the pressure.
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