Nature & Environment
Climate change and renewable energy
...system of units) known as SI. The SI unit of length, for example, is the metre (m), and the SI unit for time is the second (s). Example: What is 1000 metres in SI form? The prefix for one ‘thousand’ is ‘kilo’, so the answer is one kilometre (1 km in shortened form). One thousand metres, one kilometre and 1 km are alternative ways of describing the same thing....