What is a gas pressure gauge?
The gas pressure gauge is a device used to measure gas pressure. CHANometers can be either a closed tube or an open tube and can use water, mercury or other liquid to measure pressure. The simplest laboratory gas pressure gauge consists of a glass -shaped glass or a plastic tube connected to a pressure gas container at one end and partially filled with liquid. Digital manometers are also sold and are widely used to control gas pressure for home appliances. For example, when blowing, a balloon - the pressure of the inner air becomes greater than the pressure of the outer air and forces the elastic material of the balloon out. The gas pressure gauge uses this principle to measure the gas pressure in the container against atmospheric pressure or against vacuum. The side of the tube of the farthest of the gas container is calibrated by marks for measurement. Liquid mercury or water is used to fill the bottom of the tube.
If there is a difference in pressure between gas and atmosphere, the liquid in the U-tube will be forced in one direction. For example, if the gas is in a container with higher pressure than the atmosphere, the liquid will be pushed down from the U-tube from the container. It brings along the calibrated marks towards the open end and provides measurements that can be used to derive gas pressure. If the atmospheric pressure is greater, the pressure of the liquid towards the container is forced to cause the liquid level to drop along calibrated brands.
Because both the atmospheric pressure and the gas pressure affects the liquid in the tube, both contained gas must be taken into account when found. When gas pressure is greater than atmospheric pressure, the gas not only pushes the liquid up in the opposite tube, but also pushes the air above it. This means that atmospheric pressure must be added to measure the height of the liquid to obtain the real gas pressure. If gas pressure is lower than atmospheric pressure, the opposite applies: height measurement is deducted from atmospheric pressure to nAleen the actual gas pressure.
The closed tube pressureometer uses the same settings, but with a closed end that holds the vacuum instead of open air. This type of gas manometer avoids the problem of atmospheric pressure. Since no other pressure source does not work at the opposite end of the tube, the height of the liquid is determined only by the pressure of the contained gas. The gas makes the liquid a certain distance along the tube into the vacuum, at this point the pressure can be read.