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The mercury barometer consists of a glass tube, closed at one end, with the open end placed in a vessel containing mercury exposed to atmospheric pressure. The tube is approximately one meter long, with a scale along three-quarters of its length, marking the mercury level in millimeters of mercury (mmHg = Torr). Moving arrows are often used to represent the effect of atmospheric pressure. By measuring the height of the mercury column under the closed end of the tube, the atmospheric pressure can be accurately determined — the higher the mercury rises, the greater the atmospheric pressure.
