A series of systems usually derived from the International System of Units that are more convenient for certain applications.
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Natural units are a system of units in physics in which certain physical constants are set to 1. This simplifies many equations and relationships by eliminating the need for explicit reference to these constants. The most commonly used natural units involve the speed of light (\(c\)), the gravitational constant (\(G\)), and the reduced Planck constant (\(\hbar\)).