Perustunnusluvut

Perustunnusluvut, also known as fundamental constants or physical constants, are fixed values that are used in physical equations to describe the fundamental properties of the universe. They are considered to be universal and unchanging, as they do not depend on the location, time, or state of the observer. The most well-known of these constants include the speed of light in a vacuum (c), the gravitational constant (G), Planck's constant (h), and the elementary charge (e).

These constants are essential for the formulation and understanding of physical laws. For example, the speed of light is a fundamental limit in special relativity, while Planck's constant is crucial in quantum mechanics. The values of these constants are determined through precise measurements and experiments, and they are used to define the base units in the International System of Units (SI).

The accuracy of these constants is continually refined as new measurement techniques and technologies are developed. The Committee on Data for Science and Technology (CODATA) periodically publishes a set of recommended values for these constants, which are widely accepted in the scientific community.

In summary, perustunnusluvut are fundamental to our understanding of the physical world. They provide a consistent framework for describing the universe and are essential for the development of scientific theories and technologies.