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**Metre squared per second** or **square meter per second** is the SI derived unit of kinematic viscosity,^{[1]} specific relative angular momentum and thermal diffusivity. The unit is written in symbols as m^{2}/s or m^{2}·s^{−1} or m^{2}s^{−1}.

Specific relative angular momentum is defined as the cross product of the relative position and relative velocity. The unit may be better understood when phrased as "metre per second times metre", i.e. the velocity of an object with respect to a position.

**^**International Bureau of Weights and Measures (2006),*The International System of Units (SI)*(PDF) (8th ed.), ISBN 92-822-2213-6, archived from the original (PDF) on 2017-08-14