| Unit | Abbreviation | Value |
|---|---|---|
| Meter | m | 1,650,763.73 wavelengths in vacuo of the unperturbed transition 2p10-5d5 in Kr86 |
| Kilogram | kg | mass of the international kilogram at Sevres, France |
| Second | s | 1/31,556,925.9747 of the tropical year at 12h ET, 0 January 1900 |
| Degree Kelvin | °K | defined in the thermodynamic scale by assigning 273.16 °K to the triple point of water (freezing point, 273.15 °K = 0 °C) |
| Unified atomic mass unit | u | 1/12 the mass of an atom of the C12 nuclide |
| Mole | mol | amount of substance containing the same number of atoms as 12g of pure C12 |
| Standard acceleraaation of free fall | gn | 9.80665 m a-2 |
| Normal atmospheric pressure | atm | 101325 N m-2, 980.665 cm s-2 |
| Thermochemical calorie | calth | 4.1840 J, 4.1840 X 107 erg |
| International Steam Table calorie | cal, T | 4.1868 J, 4.1868 X 107 erg |
| Liter | l | 0.001000028 m3, 1000.028 cm3 (recommended by CIPM, 1950) |
| Inch | in. | 0.0254 m, 2.54 cm |
| Pound (avdp.) | lb | 0.45359237 kg, 453.59237 g |