fundamental quantity
Noun: A fundamental quantity is one of a small set of independent, basic physical quantities upon which all other physical quantities can be defined and measured. These quantities form the foundation for systems of measurement, such as the International System of Units (SI).
The term "fundamental quantity" is used in physics and metrology to refer to a base quantity that cannot be defined in terms of other physical quantities. Systems of measurement are built upon these chosen base quantities. - In the SI system, length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity are the seven fundamental quantities. - Choosing which quantities are considered fundamental is a convention that defines a coherent measurement system.
- "Base quantity": This is a direct synonym and is often used interchangeably with "fundamental quantity" in formal scientific contexts.
- The meter is the SI base unit for the fundamental quantity of length.
- Base quantity (n): Synonym for fundamental quantity.
- Derived quantity (n): A physical quantity that is defined as a combination of fundamental quantities through multiplication and division (e.g., speed is a derived quantity from the fundamental quantities of length and time).
- Unit (n): A definite magnitude of a fundamental or derived quantity, adopted by convention (e.g., the meter, the kilogram).
- Base quantity
- Primary quantity
- System of units: A complete set of units for fundamental and derived quantities (e.g., the SI system).
- Dimensional analysis: A technique that uses the fact that physical quantities have dimensions based on fundamental quantities.
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one of the four quantities that are the basis of systems of measurement
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