SIjohdannaisyksikkö

SIjohdannaisyksikkö, also known as a derived unit, is a measurement unit that is defined in terms of one or more base units. In the International System of Units (SI), derived units are formed by combining base units through multiplication or division. They are used to express quantities that are not directly measured by base units alone.

For example, the derived unit for area is the square meter (m²), which is obtained by multiplying the base unit of length (meter) by itself. Similarly, the derived unit for volume is the cubic meter (m³), formed by multiplying the base unit of length by itself three times.

Derived units can also be formed by dividing one base unit by another. For instance, the derived unit for speed is the meter per second (m/s), which is obtained by dividing the base unit of length (meter) by the base unit of time (second).

The SI system defines a set of coherent derived units, which are derived units that are formed using only base units and the number 10. These coherent derived units are used to express quantities that are fundamental to science and engineering.

Derived units are essential in the SI system as they allow for the expression of a wide range of physical quantities in a consistent and standardized manner. They enable scientists and engineers to communicate measurements accurately and compare results across different experiments and studies.