Original: ell_P = sqrt frac { hbar G } { c ^ 3 } approx 1.616 252 (/O81/O) times 10 ^ { -35 } mbox { meters } John Baez , The Planck LengthNIST , '' Planck 's Length '' , NIST 's published CODATA constants
Simplified: This is the ` quantum of length ` , the smallest measurement of length with any meaning .