International System of Units (SI System)
The International System of Units (SI, abbreviated from the French Systems international (d’unités)) is the modern form of the metric system and is the most widely used system of measurement. It comprises a coherent system of units of measurement built on seven base units, which are the second, meter, kilogram, ampere, kelvin, mole, candela, and a set of twenty prefixes to the unit names and unit symbols that may be used when specifying multiples and fractions of the units. The system also specifies names for 22 derived units, such as lumen and watt, for other common physical quantities.
The seven SI base units
| Symbol | Name | Quantity |
| s | second | time |
| m | meter | length |
| kg | kilogram | mass |
| A | ampere | electric current |
| K | kelvin | temperature |
| mol | mole | amount of substance |
| cd | candela | luminous intensity |
FPS system
Foot, Pound, Second, system of units which originated in the UK and since 1960 has been replaced by the Metric units the world over except a few countries such as the US. Also called imperial system.
The foot-pound-second (fps) system of units is
a scheme for measuring dimensional and material quantities. The
fundamental units are the foot for length, the pound for
weight, and the second for time. The fps system has two
variants, known as the American version and the Imperial version.
Aamir Shahzad 