Physical Quantities: Measurable quantities like length, mass, time, and temperature. Must have numerical magnitude and a unit of measurement.
Base Quantities: Fundamental quantities from which others are derived. Include length, mass, time, temperature, light intensity, electric current, and amount of substance.
Derived Quantities: Expressed in terms of base quantities. Include area, volume, velocity, acceleration, pressure, momentum, electric charge, etc.
SI System: Established during the 11th General Conference on Weights and Measures in Paris, 1968. Known as the "Universal International System of Units" or SI system.
Base Units: Units used to measure base quantities. Examples: meter, kilogram, second.
Derived Units: Units used to measure derived quantities. Examples: meter per second (velocity), square meter (area), cubic meter (volume).
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