The Relationship Between Pressure And Depth Is Used In The Air

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      The relationship between pressure and depth is used in the Air manometer (or barometer) that measures pressure. The pressure is measured by comparing the pressure at one end of the container with the known pressure at the other end.

      A standard mercury barometer for measuring atmospheric pressure is a tube with one end sealed. The sealed end is close to zero pressure, while the other end is open to the atmosphere. The pressure difference between the two ends of the tube can maintain a column of fluid in the tube, and the height of the column is proportional to the pressure difference. If the pressure at the closed end is negligible, the height of the chromatographic column is directly proportional to the measured atmospheric pressure.

      Mercury is commonly used in barometers because its high density means that the height of the chromatographic column can reasonably measure atmospheric pressure. For example, a barometer using water must be 13.6 times higher than a mercury barometer to obtain the same pressure difference. This is because the density of mercury is 13.6 times that of water.

      In an open-tube pressure gauge, one end of the tube is open to the atmosphere, so it is at atmospheric pressure. The other end is connected to the area where the pressure is to be measured. Similarly, if there is a pressure difference between the two ends of the tube, a column of fluid can be supported in the tube, and the height of the column is proportional to the pressure difference.

      The actual pressure is known as the absolute pressure; the pressure difference between the absolute pressure and atmospheric pressure is called the gauge pressure. Many pressure gauges give only the gauge pressure.

     

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