Derived Quantity
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Definition
A physical quantity defined by a mathematical combination of SI base quantities (length, mass, time, electric current, thermodynamic temperature, amount of substance, luminous intensity).
Explanation
Speed is a derived quantity: distance ÷ time = m/s. Force is mass × acceleration = kg·m/s², given the special name newton. Pressure = force ÷ area = kg/(m·s²), given the special name pascal. The SI system currently recognizes 22 derived units with special names, all traceable to the 7 base units through exact mathematical definitions.
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A numerical multiplier used to convert a quantity from one unit to another.
Precision
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How close a measurement is to the true value of the quantity being measured.
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A method of converting units by multiplying by conversion factors that equal 1.
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