Question 15 Marks
State some common rules to write SI units correctly.
Answer
View full question & answer→Guidlines for capitalization
| Guidlines | Examples | |
| Unit Names | If a unit is derived from the name of a person, its name is always written in small letters.A unit not named after persons is written in small letters. | newton (not Newton), joule (not Joule)metre (not Metre) second (not Second) |
| Unit Symbols | The symbol used for a unit is normally written in small letters.If the symbol of unit is derived from the name of a person, it is written in capital letters. If a unit is represented by more than one letters, the first letter of the symbol is capitalized. | metre : m,(not M ),,second: s (not S ) newton: N (not n), amphere : A (not a) pascal : Pa, hertz: Hz |
| Prefix Name | Prefix names are written in small letters, unless they occur at thebeginning of a sentence. No space or hyphen is used between the prefix and the unit name. So a prefix name and a unit name are taken together as a single word. | milligram (not Milligram or milli-gram of milli-gram), centimetre (not Centimetre or centi metre or (centi-metre) |
| Prefix Symbols | Prefix symbols are attached to unit symbols without any space between them. Prefix symbols up to the kilo level are written in small letters but the ones with larger values are written in capital letters. | mg (milligram) MW (megawatt) |
