Manometer To measure the pressure of gases, the method of comparing them with air pressure using a manometer is used. A liquid is poured into the U-shaped tube if the density of the liquid is present Barometer Know that we can calculate the pressure difference between gas and atmosphere. Mercury is usually used in the therapist . When the pressure of two gases in two bubbles is equal, the pressure will be 760 mm Hg (one atmosphere).
Different types of manometers:
is as followsU-shaped manometerIt is used to measure low pressures from zero to 4 inches of water and high pressures from zero to 48 inches of mercury.
Tank manometerUsed to measure low pressures of up to 12 inches of water and high pressures of up to 48 inches of mercury.
Mano mileWhich is used to measure low pressures up to 0.5 inches of water.
Manometers are typically used to compare the pressures of two different environments (which can be two containers of water or inside and outside a pipe and)). The basis of the work is that a liquid is poured into the U-tube and this liquid has a surface difference due to the pressure difference. If we know the density of the liquid in the pressure gauge, we can calculate the pressure difference between the two sides.
Mercury or water (colored) is usually used in manometers. If in a mercury manometer the difference between the surface of the two sides is 76 cm, it can be said that the two sides have a pressure difference equal to the atmospheric pressure. It is interesting to know that the pressure of the atmosphere is equal to the pressure of 10 meters of water.
Do you know why mercury is used in barometers and manometers?
If other liquids are used instead of mercury because the density of other liquids is much lower than mercury, very high glass tubes should be chosen. For example, if water is used in the barometer, the height of the glass tube should be more than 10 meters. On the other hand, because the mercury vapor pressure is very low, the top of the mercury column in the glass tube can be considered an almost complete vacuum. But liquids Others have relatively high vapor pressures that affect gas pressure determination.
A U-shaped manometer can be used to measure pressure, vacuum or pressure difference between two points. This method is one of the simplest and at the same time the most accurate methods of measuring pressure. This method is usually used in cases where the operator needs to view the pressure locally.
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One of the most important quantities measured in industrial units is quantity Pressure Is, so that to determine the type of instrumentation equipment is usually one of the items that is always in question, the system pressure and therefore its maximum tolerable pressure. Therefore, we always need equipment to be able to announce the system pressure according to environmental conditions and related standards and act accordingly.
A device called a manometer is used to measure the gas pressure inside a container. A manometer is a curved tube that contains mercury. And is calibrated in millimeters. If the pressure on both sides of the tube is equal, the mercury level in the two tubes will be the same. But if the pressure on one side of the pipe is higher, the mercury inside the pipe is displaced and the difference in mercury level on both sides of the pipe is the same as the pressure difference between the two sides of the pipe.
This animation shows a manometer you can push inside Balloons Change the connections to it and observe the changes in the mercury level in the manometer.
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