> # SI and US units SI units The international SI unitary system is the modern metrical system originating from the standard meter defined in France. SI defines seven basic units. The SI units used in ALADIN are:
> Dimension / unit | Unit | Description |
> Length / meter | m | Length of the distance the light covers in vacuum during a period of 1/299.792.458 seconds. |
> Mass / kilogram | kg | Equals to the mass of the international kilogram prototype. |
> Time / second | s | Defined according to the period length of a nuclide. |
> Thermodynamic temperature / Kelvin | °K | Defined according to the triple point of water. The common temperature indication in degrees centigrade is 273.16° higher than the indication in Kelvin. -273,16°C = 0°K (absolute zero point) |
US units The Anglo-American unitary system is used today almost only in the USA. The US units used in ALADIN are length and temperature indications. Length units are measured in miles, yards or inches in the US system. Temperatures are measured in °Fahrenheit.
| Conversion table US units to SI units
> US unit | SI unit |
> 1 mph (mile per hour) = | 1.609 km/h |
> 1 mi (mile) = | 1.609 km |
> 1 yd (yard) = 3 foot = 36 inch = | 0.9144 m |
> 0.00 °C = | 0°C [°C = (°F-32)/1.8] |
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