Chapter-1, UNITS AND MEASUREMENTS, BASIC AND DERIVED UNITS
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6 Terms
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Standard
Standard is something or a reference used as a measure for length, mass and time.
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Unit
Unit is a quantity or an amount used as a standard of measurement.
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Physical quantity
A physical quantity is the quantity that can be measured and consists of a numerical magnitude and a unit. It can be expressed as Q=Nu where Q=physical quantity, N=dimensionless number, u=unit.
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Physical quantities
Physical quantities can be classified 1.basic type(length, mass, time, temperature, electric current, amount of substance, luminous intensity) 2.derived type(area, volume, velocity, work, energy)
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The Basic quantities
The Basic quantities are called the basic units and the derived units.
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Derived Unit
A derived unit is a unit of measurement formed by combining the basic units of a system.