^Rules for writing units
- The initial letter of a unit symbol named after a scientist is written in capital letters, however the full name begins with small letter. e.g. five newtons should be written as 5 N or 5 newtons but not as 5 n.
- Symbols for various units are never used in plural form. e.g. 5 N should be written as 5 N and not as 5 Ns, however we can write 5 newtons but not 5 Newtons.
- Symbols are never followed by a full stop.
- Not more than one solidus is used. e.g. Nm– 2s– 1 shouldn’t be written as N/m2 /s.
- The use of double prefix is avoided, when single prefix is available. e.g. instead of writing μμN we should write pN.
In calculations the prefix is attached with the numerator and not with the denominator.