There are many physical constants in science. Some famous ones are the speed of light, Planck's constant, the gravitational constant, and Avogadro's number. Need a value for a fundamental physical constant? Typically, these values are learned only in the short term as you are introduced to them and forgotten as soon as the test or task is finished.
Beginning May 20, 2019, the seven SI base units (second, meter, kilogram, ampere, kelvin, mole and candela) are based on exact values of fundamental constants of physics. In addition to the already exact speed of light, on that date the Planck constant, the Boltzmann constant, the Avogadro constant and Millikan's constant (more often called elementary charge ... This chapter describes macros for the values of physical constants, such as the speed of light,, and gravitational constant,.