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test 1
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What is a physical quantity?
A property that can be measured directly or indirectly, which can be expressed as a physical quantity.
Give examples of physical quantities.
Mass, length, breadth, height, time, volume, density.
List the 7 fundamental physical quantities.
1. Mass
Length
Time
Electric current
Thermodynamic temperature
Luminous intensity
Amount of substance.
What is a derived physical quantity?
A physical quantity which is derived by combining several fundamental physical quantities.
What are the SI basic units?
Units which are used for fundamental physical quantities: meter, kilogram, second, ampere, kelvin, mole, candela.
What are the SI supplementary units?
1. Radian (rad) \n2. Steradian (sr)