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Some scientists think that physical constants may decrease as the universe gets older. There has been no evidence to support this yet.
Constants that do not have units (like length or speed) are called fundamental physical constants.
Table of physical constants [change]
|Planck's constant||6.626 0693(11) × 10-34 J·s|
|Gravitational constant||6.6742(10) × 10-11m3·kg-1·s-2|
|Speed of light||299 792 458 m·s-1|