Thanks to: mityelpoc

Length:

• 1 inch = 2.54 cm
• 1 mile = 1.6 km
• 1 km = 1000 m
• 1 m = 100 cm = 1000 mm = 10⁹ nm
• Planck Legnth = 1.616252x10^-35 m = sqrt (h_bar G/c³)
• Classical Electron Radius = 2.81794x10^-15 m = e²/ m_e c²
• Proton Radius = 0.83x10^-15 m = 0.83 femtometer = 0.83x10^-13 cm
• 1 Angstrom = 10^-10 m…