Grundgrößen

Grundgrößen are fundamental physical quantities that form the basis for defining other physical quantities. They are independent of each other and are not defined in terms of other quantities. In the International System of Units (SI), there are seven base quantities. These are length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity.

Each base quantity has a corresponding base unit. For example, the base unit for length is the meter, for mass is the kilogram, and for time is the second. Electric current is measured in amperes, thermodynamic temperature in kelvins, amount of substance in moles, and luminous intensity in candelas. These base units are defined by fundamental physical constants or through specific experimental procedures.

All other physical quantities, such as velocity, force, or energy, are considered derived quantities. They are defined as mathematical combinations of the base quantities. For instance, velocity is defined as the ratio of length to time (length/time), and its unit, the meter per second, is a derived unit. The concept of base quantities and their units is crucial for ensuring consistency and universality in scientific measurements and communication worldwide. Without them, it would be challenging to compare experimental results or build complex theories.