SI units of vacuum, what unit is vacuum?

P.A. Pascal.

Vacuum: The degree of dilution of the gas in a vacuum state, usually expressed as "high vacuum" and "low vacuum". A high vacuum means "good" vacuum, and a low vacuum means "poor".

If the pressure in the measured device is lower than the atmospheric pressure, a vacuum gauge is required for pressure measurement. The value read from the vacuum gauge is called the vacuum degree. The vacuum value is a value that indicates that the actual pressure of the system is lower than the atmospheric pressure, i.e.:

Vacuum = atmospheric pressure - absolute pressure.

1. Vacuum: According to the viewpoint of modern circular physics, vacuum is not empty, and it contains extremely rich physical content. One way to put it is:

When the pressure in the container is lower than the atmospheric pressure, the part below the atmospheric pressure is called the vacuum, and the pressure inside the container is called the absolute pressure. Another way of saying it is that any space in a container with a pressure lower than the atmospheric pressure is called a vacuum.

There is a difference in the degree of vacuum: when there is no pressure in the container, that is, the absolute pressure, etc., is only zero, it is called completely empty, and the rest is called incomplete vacuum. 2. Vacuum:

Vacuum, as the name suggests, is the degree of vacuum. In a given space, the pressure is lower than that of 101325 Pascal, which is a standard atmospheric pressure of about 101 kPa.

Commonly used vacuum units are PA, KPA, MPA, atmospheric pressure, kilogram (kgf cm2), mmhg, mbar, bar, psi, etc. The approximate conversion relationship is as follows:

1mpa=1000kpa

1kpa=1000pa

1 atmosphere = 100kPa =

1 atm = 1 kg (kgf cm2) = 760 mmHg1 atm =

1kpa=10mbar

1bar=1000mbar

Vacuum refers to the degree of thinness of a gas in a vacuum.

The first is to use "absolute pressure, absolute vacuum" (that is, how much higher pressure than the "theoretical vacuum") is used, and the general units are "PAPA, HPA hPa, KPA kPa, MPA megapa";

The second is to use "relative pressure, relative vacuum" (that is, how much lower pressure than "atmospheric pressure") to identify, the general unit "-

MPA minus how much how many megapascals".

1.Vacuum = atmospheric pressure - residual pressure.

"Vacuum", as the name suggests, is the degree of vacuum.

2.Commonly used vacuum units are PA, KPA, MPA, atmospheric pressure, kilogram with stupid roll (kgf cm2), mmhg, mbar, bar, psi, etc.

3.International Authorities generally use PA, KPA, MPA

The reading of the vacuum gauge should be:

However, "0" on the vacuum gauge indicates positive one atmosphere, and "" indicates absolute vacuum. The indicated value on the vacuum gauge does not represent the absolute value of the vacuum degree, but only the relative value of the vacuum degree.

Conversion of vacuum; According to the scale value range of this table, the absolute value and the relative value of vacuum degree can be converted using the following formula:

p=1 10e5(1-δ p - absolute value of vacuum (pa) - absolute value of the scale of the vacuum gauge, therefore, the absolute vacuum degree is 8000pa.