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The mercury barometer is made of a glass tube which is closed at one end. The other end of the tube is placed in a vessel with mercury, which is exposed to the atmospheric pressure. Glass meter-long bar is scaled approximately in 3/4 of its length, marking the mercury level in millimeters of mercury (mm Hg = Torr).
Moving arrows symbolize the action of the atmospheric pressure. Depending on the height of the mercury under the closed end of the tube, the atmospheric pressure can be determined (the higher the mercury rises, the greater the pressure is).
