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The kelvin (K) is the base unit for temperature. Kelvin is called the absolute temperature scale because it does not use degrees. The kelvin measurement intervals are equal to those of the Celsius degree scale.

The “degree Celsius” has been the only SI unit whose full unit name contains an uppercase letter since 1967, when the SI base unit for temperature became the kelvin, replacing the capitalized term degrees Kelvin. The plural form is “degrees Celsius”.

There are seven basic units in the SI system: the meter (m), the kilogram (kg), the second (s), the kelvin (K), the ampere (A), the mole (mol), and the candela (cd).

In writing, the names of SI units are always written in lowercase. However, the symbols of units named after a person are capitalized (e.g., ampere and A). These symbols are not abbreviations, so periods are not required.

What are the rules (sign conventions) to use S.I units?

- Those units which are named after the name of scientists are always written with their first or initial letter being non-capitalized.
- The symbols used for the units which are named after the name of any scientist should be written by a capital letter.

Rules and conventions for writing SI units and their symbols 2. The symbols of the units named after scientist should be written by a capital letter. For example : N for newton, H for henry, W for watt. 3. Small letters are used as symbols for units not derived from a proper name.

SI base units

Quantity | Unit | Symbol |
---|---|---|

Mass | kilogram | kg |

Time | second | s |

Electric current | ampere | A |

Thermodynamic temperature | kelvin | K |

I

The International System of Units, universally abbreviated SI (from the French Le Système International d’Unités), is the modern metric system of measurement.

As noted in Introduction to SI units there are specific rules about how SI units should be written. These include: – Values are written as a number followed by a space (representing a multiplication sign) and a unit symbol, e.g. 2.4 kg or J. This convention also applies to the per cent sign (%).