The concept of pressure, relative and absolute pressure is there a difference?

Stress the word is not strange for everybody, but relative to the pressure of the pressure and absolute pressure sounds a bit don't understand, what is the difference between the two? These two concepts are often used in the following two aspects: 1, vacuum equipment, such as micro vacuum water pump, micro pump, micro gas sampling pump, micro pump, micro gas circulation pump selection. Industry, said extreme pressure can have two kinds, one kind is & other; Absolute pressure & throughout; , i. e. , according to the & other; Absolute vacuum & throughout; ( In theory to achieve absolute vacuum, what matter all have no) Marked as zero, the value is positive, the smaller the number, the closer the absolute vacuum, which is the smaller the absolute pressure, the higher the degree of vacuum. 2、“ Relative pressure & throughout; , i. e. , according to the atmospheric pressure as zero, lower than the atmospheric pressure with negative, said the so called & other; Negative pressure & throughout; 。 The greater the absolute value of the negative, the vacuum degree is higher. For example one & other; High negative pressure micro vacuum pump & throughout; VBY2506 negative pressure for - 75KPa( - - - - - - 0. 075MPa) , there is no high VAY8828 ( VAY is - 88KPa( - - - - - - 0. 088Mpa) ) 。 Therefore, the corresponding VBY7506 didn't VAY8828 strong suction force. The international general vacuum industry, is also the most scientific is use & other; Absolute pressure & throughout; Identity; But a simple and convenient method for measuring relative pressure measuring instrument (generally Such as the general vacuum gauge are relative pressure gauge) , so the domestic use & other; Relative pressure & throughout; To identify. The relationship between them: relative pressure = absolute pressure - The local atmospheric pressure such as VAY8828 absolute pressure: 12 kpa, the relative pressure = 12 - it 100 = - 88Kpa( - - - - - - 0. 088MPa) 。 Can output positive pressure equipment, such as micro pump used to pump up, inflatable, booster; Micro water water pump, mini pump used for water circulation, water sampling, ascending, pressurization, spraying, washing, etc. In atmospheric pressure as zero, expressed as above atmospheric pressure, so called & other; Positive pressure & throughout; 。 Because generally work under atmospheric pressure, so habitually in atmospheric pressure for reference, commonly used positive pressure also means & other; Relative pressure & throughout; 。
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