CONVENTIONS TO BE FOLLWED IN SI UNITS

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 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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