What is Moderate Vacuum? What does vacuum mean?

Vacuum is a prescriptive definition: a state of gas that is less than one atmosphere of pressure (pressure) in a given space is called a "vacuum". According to the national standard GB163-1982, the vacuum is divided into several areas, the medium vacuum is between the medium vacuum, and the other areas are:

Low vacuum (10000-100pa) High vacuum (ultra-high vacuum (below.

I don't know how to play scientific notation, so I'll just take a look.

"Vacuum" is a state of space in which no matter exists, and is a physical phenomenon. Vacuum is for the atmosphere, part of the matter in a specific space is discharged so that its pressure is less than one atmosphere, then we call this space a vacuum or vacuum state.

Vacuum is often used as a unit of pressure in Pascal or Torr.

Rough Vacuum 760 1 Torr Medium Vacuum 1 10-3 Torr High Vacuum 10-3 10-7 Torr Ultra-High Vacuum 10-7 Torr or less.

1. Vacuum: According to the viewpoint of modern 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 is equal to zero, it is called a complete vacuum, and the rest is called an 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.

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, absolute pressure = atmospheric pressure + gauge pressure (- vacuum).

Definitions. The degree of gas thinness is usually used"High vacuum"with"Low vacuum"to represent. A high degree of vacuum indicates a degree of vacuum"Okay"Meaning, low vacuum means vacuum"Poor"meaning.

Explain it comprehensively. Vacuum"As the name suggests, it is the degree of vacuum. It is a main parameter of vacuum pumping equipment such as vacuum pump, micro vacuum pump, micro air pump, micro air pump, micro air pump, micro air pump, etc.

So-called"Vacuum", which is a state of gas with a pressure lower than 101325 Pascal (i.e., a standard atmospheric pressure of about 101 kPa) in a given space.

In a vacuum, the thinner of the gas is usually expressed in terms of the pressure value of the gas, and obviously, the lower the pressure value, the thinner the gas.

Vacuum: Theoretically, the volume does not contain any substance, but in reality there is no real vacuum. The air pressure inside the container is usually lower than normal atmospheric pressure.

101325pa) is called a vacuum.

VacuumIt is a pressure lower than normal atmospheric pressure (101,325 Pa). The more authoritative is that the Lanzhou Institute of Physics divides the vacuum state below the normal atmospheric pressure into five types

Low vacuum: 100000pa-100pa

Medium vacuum: High vacuum:

Ultra-high vacuum: Very high vacuum: Below.

PA refers to pressure. The written writing and measuring meter display method is: such as 100000Pa is written as 10e 5pa (reading:

10 to the 5th power, usually read 100,000 papa); It is written as 10e -2pa (pronounced 10 to the minus 2 power, usually pronounced minus 2pa).

The degree of gas thinner in a vacuum.

Vacuum degree is a major parameter of vacuum pumping equipment such as vacuum pumps, micro vacuum pumps, micro air pumps, micro air pumps, micro air pumps, and micro air pumps. A vacuum is a condition in which the pressure of a given space is lower than 101325 Pascal (i.e., a standard atmospheric pressure of about 101 kPa).

In the case of vacuum, the degree of indifference of the gas is generally indicated by the pressure value of the gas, and significantly, the smaller the pressure value, the more indifferent the gas.

There are two ways to identify the degree of vacuum:

It is expressed as a certain pressure, a certain vacuum degree (i.e., how much higher pressure than the theoretical vacuum).

In practice, the vacuum pump must have a pressure value between 0 and 0. The certain pressure value needs to be measured with a certain pressure surface, and in the place where the altitude is equal to 0, the initial value of the surface used to measure the vacuum degree (the must vacuum gauge) is. (i.e. one standard atmosphere).

It is identified by relative pressure, relative vacuum (i.e., how much pressure is lower than atmospheric pressure).

The relative vacuum degree is the difference between the pressure of the measured policy and the air pressure at the measurement address. Generally, it is measured with a vacuum gauge. In the absence of vacuum (i.e., at normal pressure), the initial circle of the watch is 0.

When measuring the vacuum of the chamber, its value is between 0 and generally marked with a negative number). <>