Planck Length

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	\(\large{\frac{ft}{sec}}\)	\(\large{\frac{m}{s}}\)