Basismessgrößen

Basismessgrößen, often translated as "basic measurement quantities" or "fundamental quantities," are the seven internationally defined units of measurement that form the foundation of the International System of Units (SI). These quantities are considered independent of each other, meaning they cannot be defined in terms of other fundamental quantities. The SI base units are the meter for length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for thermodynamic temperature, the mole for amount of substance, and the candela for luminous intensity.

The concept of base quantities is crucial for establishing a consistent and coherent system of measurement. By defining a set of fundamental units, all other physical quantities can be expressed as combinations of these base quantities through a process called dimensional analysis. For example, velocity, a derived quantity, is expressed as length divided by time (m/s). This systematic approach ensures that measurements made in different locations or by different individuals can be compared and are mutually consistent. The redefinition of several SI base units in 2019, based on fundamental physical constants, further strengthened the stability and universality of the system.