Relationship between vacuum degree and pressure in vacuum pump selection

Relationship between vacuum degree and pressure in vacuum pump selection

In the selection and use of vacuum pump, we usually use the limit pressure or vacuum degree, as well as pumping speed, flow and other parameters to determine the performance of vacuum pump. And then there's a problem here, where many customers struggle with the relationship between vacuum and pressure.

Vacuum refers to the rarefaction of a gas. We usually use "high vacuum" and "low vacuum" to express it. In other words, the rarer the gas is, the higher the vacuum degree is; otherwise, it means the vacuum is low, which is always expressed by pressure. The pressure in vacuum system is synonymous with pressure, which refers to the vertical force of gas on the surface of solid or liquid per unit area. Therefore, we can generally understand that the more gas, the greater the natural force on the surface of the object, the greater the pressure; on the contrary, the less gas, the smaller the force, the smaller the pressure.

The higher the vacuum degree is, the thinner the gas is. That is to say, the less the pressure on the object will be. The lower the vacuum degree is, the more gas there is, the greater the pressure will be.

Therefore, when we select the vacuum pump, we can see that the lower the limit pressure, the higher the vacuum degree of the vacuum pump, and the more thorough the corresponding pumping performance, which can achieve lower pressure in practical application.