| Indicated on pressure gauge |
| 1 - | Temperature scale for refrigerant R134a CF3– CH2F or CH2F– CF3 |
Note | Pressure can be measured in various units: 1 MPa (megapascal) is equivalent to 10 bar gauge pressure, or 145 psi; 1 bar absolute pressure is the same as 0 bar gauge pressure, which is roughly equivalent to atmospheric pressure. |
| In addition to the pressure scale, pressure gauges may have one or more temperature scales. The scale values for R134a are assigned according to the vapour pressure table. As different refrigerants develop different vapour pressures at the same temperature, each temperature scale is marked for the appropriate refrigerant. |
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| Pressure gauges permit the following test and measurement operations → Chapter. |
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