Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
A physical quantity is a property of a material or system that can be quantified by measurement. Examples include length, time, mass, and temperature.
5 Must Know Facts For Your Next Test
Physical quantities are classified as either fundamental (base) or derived quantities.
The International System of Units (SI) defines seven base units for the fundamental physical quantities.
Derived quantities are expressed as algebraic combinations of base quantities.
Dimensional analysis helps in checking the consistency of equations involving physical quantities.
Measurement accuracy and precision are crucial when working with physical quantities.
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Related terms
Fundamental Quantity: A basic physical quantity that cannot be defined in terms of other quantities. Examples include length, mass, and time.
Derived Quantity: A physical quantity obtained from the combination of fundamental quantities. Examples include velocity, acceleration, and force.
SI Unit: The International System of Units (SI) is the modern form of the metric system and comprises a coherent system of units based on seven base units.