what do you mean by derived units

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Nature

Derived units are units of measurement that are formed by combining two or more base units from the International System of Units (SI). They arise from mathematical relationships between the fundamental physical quantities and can be expressed as products, quotients, or other algebraic combinations of the base units. For example, speed is a derived quantity measured in meters per second (m/s), which combines the base units of length (meter) and time (second). Other examples include force measured in newtons (N) and energy measured in joules (J). These derived units help describe physical quantities that cannot be represented by a single base unit alone.