The Planck length is a fundamental physical constant that represents a scale at which classical ideas about gravity and space-time cease to be valid, and quantum effects become significant. It is defined in terms of three fundamental constants: the speed of light in a vacuum (c), the gravitational constant (G), and the reduced Planck constant (ħ).
The formula for the Planck length (\(L_P\)) is given by:
\[
L_P = \sqrt{\frac{\hbar