|Definition:|| mathematical relation between quantities in a given system of quantities, independent of units of measurement
NOTE The general form of a quantity equation is f(Q1, Q2, ... Qn) = 0, where Q1, Q2, ... Qn denote different quantities. A simple form of a quantity equation is Q1 = ζ Q2 Q3, where ζ is a numerical factor.
- T = (1/2) mv2, where T is the kinetic energy and v the speed of a specified particle of mass m;
- n = I·t/F, where n is the amount of substance of a univalent component, I is the electric current and t the duration of the electrolysis, and where F is the Faraday constant.