order of magnitude

suuruusluokka kymmenjärjestelmässä

suuruusluokka The class of scale or magnitude of any amount, where each class contains values of a fixed ratio (most often 10) to the class preceding it. For example, something that is 2 orders of magnitude larger is 100 times larger, something that is 3 orders of magnitude larger is 1000 times larger, and something that is 6 orders of magnitude larger is a million times larger, because 10^2 = 100, 10^3 = 1000, and 10^6 = a million.
2011, w:Enrico Fermi|Enrico Fermi, s:Wikisource:Translations Wikisource (translator), s:Electrodynamic and Relativistic Theory of Electromagnetic Mass|Concerning a Contradiction between the Electrodynamic and Relativistic Theory of Electromagnetic Mass, 1922, Enrico Fermi, Über einen Widerspruch zwischen der elektrodynamischen und relativistischen Theorie der elektromagnetischen Masse, Physikalische Zeitschrift, v 23, pp 340-344,

However, we notice that although this contraction is of order of magnitude v^{2}:c^{2}, it changes the most important terms of electromagnetic mass, i.e, the rest mass.