Question

what are the rules of writing SI units ?​

Answer 1

Rules for writing SI Units

 1.  While writing a  Number having five or more digits, the digits should be placed in groups of three separated by spaces(No need of using commas) counting both to the left and the right of the decimal point. [Example: 978542.456289 should be written as 978 542.456 289 ]

  2. A four-digit number doesn’t need to maintain the grouping of three separated by spacing unless the four-digit number is used in a column of numbers with five or more digits.

   3.A dash(-) is needed to be used to separate units that are multiplied together in S.I units. [Example: newton x meter should be written as N-m ]

   4.The plural of units is not allowed to use with the units symbols. [ Example: if the units are metre or metres, we should write as m only ]

   5.The unit symbols should be written in lower case(small letters), except the unit symbols derived from the proper names. [Example: while writing any units like meters,  pounds, inches, we should write them in lower case= m, lb, in, but when it comes to newton, watt we should write them with uppercase letter N, W respectively]

  6. While mentioning the unit with the complete/full name should be written in lower case(small letters) only. Should not write in Uppercase(Capital Letter). [Example: while mentioning the units we should write as newton and watt, when referring their names we can write as Newton, Watt]

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Answer 2

✎ Rules for writing SI units :

• Small letters are used to write the symbols of unit.
• The initial letter of symbol of unit is written in capital only when it is named after a scientist.
• The full form of unit is always written in small letters even if it has been named after a scientist.
• Writing of a unit is not followed by full stop.
• Units are not written in plural form.

⫸ More To Know :

There are 4 Systems of units.

• FPS System : Foot Pound Second.
• CGS System : Centimetre Gram Second.
• MKS System : Metre Kilogram Second.
• SI System : International System.

SI System :

In 1971 CGPM held it's meeting and decided a system of units which is known as the International System of Units. It is abbreviated as SI from the French name Le System International d' Unites. This system of unit is accepted internationally for scientific, technical, commercial and industrial work.