FUNDAMENTAL AND DERIVED QUANTITIES AND UNITS
CONTENT
Fundamental Quantities
- The Concept of Fundamental Quantities
- Other Fundamental Quantities
Derived Quantities
- The Concept of Derived Quantities
- Dimensions and Units of Derived Quantities
Fundamental Quantities
The Concept of Fundamental Quantities
Fundamental quantities are physical quantities whose dimensions and units are not usually derived from other physical quantities. Basically, there are three fundamental quantities in mechanics. They include:
(i) Mass
(ii) Length and
(iii) Time
(i) Mass: This is a fundamental quantity with dimension ‘M’, usually written in capital letter. The S.I. unit of mass is kilogramme (kg). Mass can also be measured in gramme (g), tonne (t), etc.
(ii) Length: This is another fundamental quantity with dimension ‘L’, written in capital letter. The S.I. unit of length is metre (m). Length can also be measured in kilometre (km), centimetre (cm), inches (inch), feet (ft), etc.
(iii) Time: Time is a fundamental quantity with dimension ‘T’, also written in capital letter.
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