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A table of physical constants expressed in SI units, with values, uncertainties and references. Includes constants related to speed of light, Planck constant, Boltzmann constant, Newtonian constant, cosmological constant, elementary charge, fine-structure constant and more.
Find the latest values of the fundamental physical constants recommended by CODATA for international use. Search by name, browse by category, or see the correlation coefficient between any pair of constants.
A physical constant is a quantity that cannot be explained by a theory and must be measured experimentally. Learn about the characteristics, examples, numerical values, and units of physical constants, and how they relate to the International System of Units and natural units.
A comprehensive list of physical constants with values, symbols, sources and equations. Includes exact, computed and measured constants for astronomy, mechanics, electromagnetism and more.
10 Ιουν 2009 · NIST provides values, citations, and guidelines for the basic constants and conversion factors of physics and chemistry. Learn about the International System of Units (SI) and how to express measurement uncertainty.
12 Οκτ 2018 · Learn about the seven constants that define the base SI units in the revised SI system. See how they relate to physics, chemistry, quantum mechanics and human perception.
Learn what a physical constant is and how it appears in the basic equations of physics. Find out the values and units of some important physical constants, such as the speed of light, the charge on the electron and the universal gravitational constant.
