The Planck length (formula_1) is the smallest unit of length. It is calculated from three physical constants: the speed of light, the Planck constant, and the gravitational constant. The length was established as a way to simplify many of the more fundamental equations — if equations are written in Planck units, you can do away with many physical constants and not have to worry about dimensions. The Planck length does not have any precise physical significance, and it is a common misconception that it is the inherent “pixel size” or smallest possible length of the universe. If a length smaller than this is used in any measurement, then it has a chance of being wrong due to quantum uncertainty.
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