Planck Length

The planck length was named after Max Planck.

It is defined as:
 * $$\ell_\text{P} =\sqrt\frac{\hbar G}{c^3} \approx 1.616 199 (97) \times 10^{-35} \mbox{ m}$$

It is: :$$\ell_\text{P} =\sqrt\frac{\hbar G}{c^3} \approx 1.616 199 (97) \times 10^{-30} \mbox{ m}$$ times smaller than the proton in diameter.