Tables showing the SI equivalents of metric units and some older units commonly used such as Bar (bar), Pascals (Pa), Pound per Square Inch (psi) and Atmosphere (atm).
Units of Pressure Table
| Unit | SI equivalent | Inverse |
|---|---|---|
| 1 bar (≈1 atmosphere) | equals 105 Pa (pascals) | 1 Pa = 10-5 bar |
| 1 kgf m-2 | equals 9.807 Pa | 1 Pa = 0.102 kgf m-2 |
| 1 lbf in-2 (or psi) | equals 6.895 Pa | 1 Pa = 1.450 x 10-4 psi |
The Royal Society (1975) Quantities, Units and Symbols, London, The Royal Society