Vacuum and negative pressure

The relationship between vacuum and negative pressure, is vacuum a negative pressure? Does negative pressure mean vacuum? Let's take a look at the concepts of vacuum and negative pressure:

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Negative pressure: In short, negative pressure is lower than normal pressure, which is usually the state of gas below atmospheric pressure. For example, when we drink boxed milk, the straw can suck the air inside and it will not be replenished. Flat, this is because the pressure inside the box and the surrounding air pressure are not equal, the pressure in the box is less than the surrounding environment, forming a negative pressure.

Vacuum: Vacuum is a very broad concept. How many degrees is called vacuum? There is no exact standard. Generally, the pressure is less than 100,000 Pascals. In industrial applications, it is generally divided into low vacuum, high vacuum, and ultimate vacuum, which are relative vacuum degrees. In the vacuum state, the pressure of the gas is usually used to express the degree of vacuum. The higher the degree of vacuum, the thinner the gas. The commonly used vacuum units are KPA, MPA, PA, PSI, atmospheric pressure, MBAR, etc. "The results can be obtained with a vacuum gauge, which is generally cheaper and therefore widely used on vacuum equipment.

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In practical industrial applications, vacuum pumps are commonly used to obtain vacuum conditions to meet industrial production needs, that is, the air pressure inside the equipment is much lower than the pressure of the surrounding external air. The higher the negative pressure ratio, the higher the material requirements for the equipment. In order to withstand deformation without deformation.

From the above analysis of vacuum and negative pressure, it can be seen that they are all lower than the surrounding environment pressure from a relative angle. The negative pressure is compared with the external environment, and the vacuum is not an absolute state of no air. When we are in a vacuum environment, the negative pressure and vacuum are not necessarily equal.