Unit
A unit in conjunction with a numerical value describes the quantitative value of a physical dimension. Units are defined and expressed in a unit system (see also SI) as:
physical dimension = numerical value·• unit
e. g. length l = 1.83 m
The SI units are binding in Germany as statutory units for official and commercial transactions. There are seven SI base units, from which further units are derived. see Fig. 1 Unit
| Base quantity | Base unit | |
Name | Symbol | |
| Length | Metre | m |
| Mass | Kilogram | kg |
| Time | Second | s |
| Electric current | Ampere | A |
Thermodynamic | Kelvin | K |
| Luminous intensity | Candela | cd |
| Amount of substance | Mol | mol |
Fig. 1 Unit: SI base quantities and units
A complete list of statutory units is contained in the brochure entitled "Gesetzliche Einheiten im Pumpenbau" (statutory units in pump manufacture) by the German Engineering Federation (VDMA).
See in Appendix, Fig. 2 Unit
