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Pressure, gauge pressure, absolute pressure, static pressure of understanding

by:KAIDI     2020-11-04
Correctly understanding the pressure, the pressure measurement gauge pressure, absolute pressure, static pressure in the pressure measurement, commonly used absolute pressure, gauge pressure and negative pressure or vacuum. Absolute pressure refers to the measured medium role in the full weight of the container per unit area, with symbol pj said. Used to measure absolute pressure instrument called the absolute pressure gauge. Average pressure produced by the air column on the ground is called the atmospheric pressure, with symbol pq said. Used to measure the atmospheric air pressure meter is the barometer. The difference of the absolute pressure and atmospheric pressure. Called table pressure, use symbol pb said. Pb = pj - namely pq。 When absolute pressure value is less than the atmospheric pressure, negative pressure ( The negative pressure) , the absolute value of the negative pressure value, known as the vacuum degree, represented by symbol pz. Used to measure the vacuum degree of the instrument is called vacuum gauge. Both can measure pressure value and instrument called pressure vacuum gauge to measure the vacuum degree. When absolute pressure value is less than the atmospheric pressure, negative pressure ( The negative pressure) , the negative pressure value and the difference between the atmospheric pressure value, known as the vacuum degree of vacuum = - atmospheric pressure Absolute pressure added comprehensive explanation: & other; Vacuum & throughout; Just as its name implies is the degree of vacuum. Is a vacuum pump, mini vacuum pump, mini pump, mini pump, mini suction pump vacuum equipment such as one of the main parameters. The so-called & other; Vacuum & other; , it is to point to in a given space, the pressure is lower than 101325 (PASCAL A standard atmospheric pressure is 101 kpa) State of the gas. Under the vacuum state, the thin degree of the gas often said with a gas pressure value, obviously, the smaller the pressure value gas is thinner. For vacuum logo usually there are two ways: one is to use & other; Absolute pressure & throughout; 、“ Absolute vacuum & throughout; ( Namely than & other; Theory of vacuum & throughout; How much high pressure) Identity; In reality, the absolute pressure of vacuum pump value between 0 and 101. Between 325 kpa. Absolute pressure value need to use absolute pressure meter, = 0 at 20 ℃, altitude, instrument used for measuring the vacuum degree ( Absolute vacuum table) The initial value is 101. 325KPa( That is, a standard atmospheric pressure) 。 The second is to use & other; Relative pressure & throughout; 、“ Relative degree of vacuum & throughout; ( Namely than & other; Atmospheric pressure & throughout; How much low pressure) To identify. 'relative vacuum pressure refers to the object under test and measurement site atmospheric pressure difference. Using ordinary vacuum gauge measurement. In the absence of a vacuum state ( The atmospheric pressure) , the table of the initial value of 0. When measuring the vacuum, its value between 0 and 101. 325KPa( Negative in general) In between. Such as, there is a mini vacuum pump PH2506B, measured values for - 75 kpa, said pump can draw the atmosphere than measuring location down 75 kpa vacuum. The international general vacuum industry & other Vacuum & throughout; And the most scientific with the absolute pressure identification; Refers to have & other Ultimate vacuum, vacuum absolutely, absolute pressure & throughout; But & other; Relative degree of vacuum & throughout; ( Relative pressure, pressure, negative pressure vacuum table) As a result of the measurement method is simple, measurement instrument is very common, easy to buy and cheap, so there are a wide range of applications.
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