Planck length

The Planck length (named after Max Planck) is the shortest measurable distance, and also a quantum of space and the diameter of a pilitron in the pilitron theory. Quantum mechanics defines it as:

$$\ell_P =\sqrt\frac{\hbar G}{c^3} \approx 1.616 199 (97) \times 10^{-35} \mbox{ m}$$

From this we also have a Planck area and a Planck volume.