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“Physical constants” is a book category focused on the fundamental numerical parameters that govern the laws of nature, such as the speed of light, Planck’s constant, the gravitational constant, Boltzmann’s constant, Avogadro’s number, the elementary charge, and dimensionless quantities like the fine-structure constant. Works in this category range from textbooks and monographs to handbooks and popular science, covering the discovery and history of these constants; the precision experiments and metrology behind their measurement and uncertainties (e.g., CODATA values); their roles across classical, quantum, and relativistic physics; and their central place in defining and realizing the SI units. Many titles compile up-to-date data tables and standards for researchers and students, while others explore conceptual and philosophical issues such as natural units, universality, and whether constants might vary over time, connecting these ideas to cosmology, materials, and technological applications.

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