CONVENTIONS TO BE FOLLWED IN SI UNITS
1. When we write a unit in full, the first letter should not be in capital letter.
EXAMPLE
metre and not as Metre
kilogram and not as Kilogram
2. The symbols of unit in the name of scientist should be in upper case (capital) letter
EXAMPLE
N for newton, J for joule
3. Only the singular form of the unit is to be used.
EXAMPLE
km and not as kms
Kg and not as kgs
4. There should be no full stop at the end of the abbreviations.
EXAMPLE
mm and not as mm
kg and not as kg
5. When temperature is expressed in Kelvin, the degree sign is omitted.
EXAMPLE
273K not as 2730K
6. Only accepted symbols should be used.
EXAMPLE
ampere is represented as 'A' and not 'amp'
second is represented as 's' and not 'sec'
7. Use of the solidus or slash is to be avoided, but when used, not more than one solidus be employed.
EXAMPLE
J/k.mol or Jk.mol-1 but not J/k/mol
J kg-1 K-1 but not J/kg/K
8. One letter space is always to be left between the number and the symbol of the unit.
EXAMPLE
2.3 m and not as 2.3m
Kg m s-2 and not kg ms-2
9. The numerical value of any physical quantity should be expressed as p= a × 10m. Here 'a' is a number between 1 and 10 and 'm' is the appropriate power of 10.
EXAMPLE
velocity of light c = 2.997 × 108 m s-1
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