The orders of magnitude of speed is a comparative list of various speed levels spanning many scales of measurement, ranging from the near-imperceptible expansion of space under Hubble's law to the ultimate physical limit of the speed of light. Speeds across this range are encountered in natural phenomena, human-made objects, biological processes, and fundamental physics. To help compare different orders of magnitude, the following list describes various speed levels between approximately 2.2×10−18 m/s and 3.0×108 m/s (the speed of light). The list is organized by orders of magnitude, grouping entries by successive powers of ten. Values in bold are exact.
List of orders of magnitude for speed
See also Typical projectile speeds - also showing the corresponding kinetic energy per unit mass Neutron temperature
References