Fundamentalconstantbased

Fundamentalconstantbased is a term used to describe approaches that construct theoretical frameworks, measurement systems, and computational models by grounding them in fundamental physical constants rather than arbitrary artifacts or derived units. In practice, it emphasizes expressing quantities as functions of constants such as the speed of light, Planck constant, elementary charge, Boltzmann constant, and other universal quantities, and adopting unit conventions in which these constants take fixed, exact values.

The core idea is to promote naturalized or invariance-based representations that remain stable across different experimental contexts and reference frames. This can simplify equations, reveal the dimensionless structure of physical laws, and reduce dependency on human-scale or artifact-based units. Natural unit systems, for example, set certain constants to unity to streamline theoretical work, while metrological practices aim to anchor real-world measurements to fixed constants.

Applications span metrology, fundamental physics, quantum information, and high-precision computation. In metrology, the 2019 redefinition of SI base units anchored units to fixed values of fundamental constants, illustrating a concrete move toward constant-based standards. In theoretical physics, expressing theories in natural units or in terms of dimensionless quantities highlights universal relations independent of specific unit choices.

Benefits include improved reproducibility, clearer dimensional analysis, and greater cross-disciplinary consistency. Potential drawbacks involve incomplete knowledge of certain constants, the practical complexity of switching to constant-based schemes for some measurements, and the possibility that fixing constants can obscure experimental subtleties in certain domains.

Notable examples include natural unit systems and the SI redefinition that fixes fundamental constants to define base units.