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Physical_constant

In science, a physical constant is a number (physical quantity) that does not change. This is different from a mathematical constant, which is not based on a real measurement.

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.

Some scientists think that physical constants may decrease as the universe gets older. There has been no evidence to support this yet. view more...