UNITS MEASUREMENT SYSTEM
Measurement of units Abbreviate units of measurement when they are preceded or followed by a number. Examples: Rs. 100, 8 in., 50 cm, 150 lb, No. 54, 10% Write abbreviations in singular even if they have plural connotations. Examples: 150 lb, but not 150 lbs; 10cm, but not 10 cms. Exceptions: Figs., pp., ll., cols.

For large numbers use symbols and abbreviations for readability. Example: instead of 10,00,000 rupees or 10 lakh rupees, write Rs. 10 lakh.

Million and billion are used in singular when they are preceded by a figure. But the practice in India is to write “Rs. 10 crores” or “Rs. 10 lakhs.” On the basis of analogy of the English language structure, the plural of lakhs or crores is incorrect. The abbreviated “\$ 10 million” is read as “10 million dollars”; so also “Rs.10 lakhs” is read as “10 lakh rupees” but not as “10 lakhs rupees” or “rupees 10 lakhs.” There is no analogy in Indian languages to justify the use of the plural of “lakh” and “crore” in this situation.

(SI – Unit System)
 No. Fundamental Quantity Fundamental Symbol 1 Length meter M 2 Mass Kilogram kg 3 Time second s 4 Electric Current ampere A 5 Thermodynamic temperature kelvin K 6 Luminous intensity candela cd 7 Quantity of matter mole mol
Uses of symbols of the units

One has to use the symbols of the units as mentioned in above table only. See that all symbols use small alphabets only, unless the unit is named after a scientist. Symbols should be written ‘upright type’ only not in italics.

See the following table carefully.

 Unit Incorrect method (x) Correct method (√) meter M, m M Kilogram KG, Kg, kg kg second S. s s kelbin ok, ok K gram GM, gm G
International System of Numbers and Unit
Description can be in any language like Gujarati, Hindi, English, Russian etc. But magnitude of the quantity should be written in international system of numbers and unit should be mentioned as per first table only. (This is why symbols are said to be international).
 Measure of Quantity Incorrect method (x) Correct method (√) 40 meter 40m. 40 m 5 Kilometer 5km. 5 km
Unit Measurement System - Singular or Plural
Unit should not be written in plural. They are always in singular e.g. we should write 10 m instead of 10 meters or 10 ms.
 Measure of Quantity Incorrect method (x) Correct method (√) 10 meters 10 ms. 10 m 10 Kilometer 10 kms. 10 km 10 kilograms 10 kgs. 10 kg 10 centimeter 10 cms. 10 cm 10 seconds 10 sec. 10 s 10,00,000 10 lakhs 10 lakh 10,00,00,000 10 crores 10 crore
Avoid Full Stop in Unit Measurement
‘Full stop’ should not be put between the letters of symbol or at the end of the symbol.
 Measure of Unit Incorrect method (x) Correct method (√) centimeter c.m., cm. Cm kilogram k.g., kg. kg kilometer k.m., km. km
Use of Capital Letter in Unit Measurement
If the unit, named after a scientist, is chosen, and it is written fully, its first letter should not be capital. If its symbol in used, its first letter is written capital.
 Measure of Unit Unit Incorrect method (x) Correct method (√) Force Newton Newton, n Newton, N Electric current Ampere Ampere, amp Ampere, A Temperature Kelvin Kelvin, k Kelvin, K Electric Charge Coulomb Coulomb, c Coulomb, C
Use of Numerator and Denominator in Unit Measurement
Quantities appearing in numerator and denominator in a derived unit should be expressed as a single ratio. Also leave some space between symbols of two unit. E.g. meter / second / second is incorrect, it should be m/s2.
 Derived unit Unit Incorrect method (x) Correct method (√) Velocity meter / second m/s, m/s-1, ms-1 m/s, m s-1 acceleration meter / second2 m/s2, m s-2, ms-2 m/s2, m s-2
Avoid use of Full Forms in Unit Measurement
In a derived unit if more than one base unit are written, either write their full forms or symbols. Don’t write full form of one and the symbol of the other.
 Quantity Unit Incorrect method (x) Correct method (√) Momentum meter / second kg meter/s kg m/s kilogram m/s or kg m/second kg m s-1
Use of Oblique(/) or Negative(-) in Unit Measurement
In case of a derived unit which is a ratio of two base units, oblique line (/) horizontal line (-) or negative power can be used. e.g. m/s, m-s, m s’ and denominator in a derived unit should be expressed as a single ratio. Also leave some space between symbols of two units. e.g. m / s, m s-1.
English Grammar : Noun

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