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A physical measurement that does not contain directional information.<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>
A ''scalar quantity'' is a measurement that does not contain directional information,<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref> but only magnitude.<ref>Stewart, James. ''Calculus: Early Transcendentals''. Brooks/Cole, 2008</ref> It is opposed to a [[vector quantity]], which contains both magnitude and direction.
Every [[real number]] is a scalar, because it contains only magnitude. Scalar quantities also exist in the real world, such as temperature. (Note, however, that the change in temperature is a vector.)
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[[Category:Physics]]