Length scale

In physics, length scale is a particular length or distance determined with the precision of one order (or a f

Examples

• The atomic length scale is $\ell _{a}\sim 10^{-10}$ meters and is given by the size of hydrogen atom (i.e., the Bohr radius (approximately 53 pm)) which is set by the electron's Compton wavelength times the fine-structure constant: $\ell _{a}\sim 1/\alpha m_{e}$.