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Manual for Refrigeration Servicing Technicians

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Manual for Refrigeration Servicing Technicians ( manual-refrigeration-servicing-technicians )

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4 Pressure units for vacuum A variety of different units of measurement are employed for quantifying pressures, which can easily lead to confusion. The below Table 4.1 provides a conversion of certain units of pressure for standard atmospheric pressure, 1 bar, and the recommended highest level of vacuum (ideally, evacuation pressure should be below this). Note also that the pressures are indicated in absolute pressure, not gauge pressure. SI units bar kilo Pascal micron millibar Pascal (Pa) Non-SI units: inch of mercury mm of mercury Torr pounds (force) per square inch Standard atmosphere 1.01325 bar 101.3 kPa 1013250 microns 1013.25 mbar 101325 Pa 30.5 in Hg 760 mm Hg 760 Torr 15.0 psi 1 bar (absolute) 1 bar 100 kPa 1,000,000 microns 1000 mbar 100,000 Pa 29.5 in Hg 750 mm Hg 750 Torr 14.5 psi Preferred vacuum level (absolute) 0.001 bar 0.10 kPa 1000 microns 1 mbar 100 Pa 0.030 in Hg 0.75 mm Hg 0.75 Torr 0.015 psi 95 Servicing Practices

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