# Planck Length

on . Posted in Relativity

Planck length, abbreviated as $$l_p$$, is the fundamental unit in the system of Planck units.  It is thought to be the smallest possible length in a section on spacetime.  It is a useful unit in theoretical physics.

• $$\large{ l_p = 1.616, 229 \;x\;10^{-35}\;m }$$

## Planck Length Formula

$$\large{ l_p = \sqrt{ \frac{ h\;G } { c^3 } } }$$
Symbol English Metric
$$\large{ l_p }$$ = Planck length $$\large{ft}$$ $$\large{m}$$
$$\large{ G }$$ = gravitational constant $$\large{\frac{lbf-ft^2}{lbm^2}}$$  $$\large{\frac{N - m^2}{kg^2}}$$
$$\large{ h }$$ = Planck constant $$\large{\frac{lbf-ft}{sec}}$$ $$\large{J-s}$$
$$\large{ c }$$ = speed of light in vacuum  $$\large{\frac{ft}{sec}}$$  $$\large{\frac{m}{s}}$$

Tags: Magnetic Equations