Write the rules that are followed in writing the symbols of units in SI system.

Rules that are followed in writing the symbols of units in SI system are:

i) The symbols of the units named after scientists should be written by the initial capital letter. E.g. N for newton, H for henry, A for ampere and W for watt.

ii) Small letters are used as symbols for units not derived from a proper noun. E.g. m for metre, kg for kilogram.

iii) No full stop or other punctuation marks should be used within or at the end of symbols. E.g. 50 m and not as 50 m.

iv) The symbols of the units are not expressed in plural form. E.g. 10 kg not as kgs.

v) Use of solidus is recommended for indicating a division of one unit symbol by another unit symbol. Not more than one solidus is used. E.g. ms^-1 or m/s. J/K/mol should be JK^-1 mol^-1

vi) Accepted symbols alone should be used. E.g. ampere should not be written as amp and second should not be written as sec.