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...PHYSICAL QUANTITY NAME OF UNIT SYMBOL FOR UNIT length metre m time second s mass kilogram kg temperature kelvin K amount of substance mole mol electric current ampere A luminous intensity candela cd Most of these base units relate to physical descriptions that apply universally. The SI base unit of time, the second, is defined as the period over which the waves emitted by...

...physically (it is not broken). The assembly of components that forms a system does something, it carries out some process. This process will work on inputs, carry out transformations and produce outputs in order to achieve a goal. If you view your body as a system, it consists of organs, it takes oxygen and food as inputs, and does transformations that keep you alive. As...