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Vacuum meter reading and vacuum conversion
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Vacuum gauge reading and vacuum degree conversion vacuum degree with "absolute vacuum degree" , "absolute pressure" , that is higher than "theoretical vacuum" how much pressure mark;. In practice, the absolute pressure of vacuum pump is between 0 ~ 101.325 KPA. The absolute pressure shall be measured with an absolute pressure gauge. At 20 °C, at altitude = 0, the initial value of the instrument used to measure the degree of vacuum (absolute vacuum gauge) shall be 101325Pa (i.e. a atmosphere) . Vacuum degree is marked by relative vacuum degree, relative pressure, that is, how much lower than atmospheric pressure, and relative vacuum degree is the difference between the pressure of the measured object and the atmospheric pressure of the measured place. It can be measured with an ordinary vacuum meter. In the absence of a vacuum, the initial value of the meter is 0, it ranges from 0 To-101325pa (- 0.1 MPA) . On the vacuum meter, "0" means positive one atmosphere pressure (101325PA) , and"-0.1" means absolute vacuum (0) . The indicator value on the vacuum meter does not represent the absolute value of the vacuum degree, but only the relative value of the vacuum degree. The absolute and relative values of the vacuum degree can be converted by the following formula: p ≈100000(1-0.1) PA; the absolute number of readings indicated by the vacuum meter. A vacuum gauge reading of 0 means that P ≈100000 = 10000pa is 1 atmosphere. If the vacuum gauge reads 0.1, then p ≈1100000(1-0.1/0.1) = 0PA is absolute vacuum. The vacuum gauge reads 0.075, then P ≈100000(1-0.0750.1) = 25000pa. The vacuum gauge reads 0.08, then P ≈100000(1-0.080.1) = 20000pa. The vacuum gauge reads 0.09, then P ≈100000(1-0.090.1) = 1000pa. The vacuum gauge reads 0.095, then P ≈100000(1-0.0950.1) = 5000pa. The vacuum gauge reads 0.097, then P ≈100000(1-0.0970.1) = 3000pa. The vacuum gauge reads 685 MMHG, then P ≈100000(1-685760) = 10000pa. The vacuum gauge reads 700 MMHG, then P ≈100000(1-700760) = 8000 Pa.