A scalar (physics), a physical quantity that has the same value under any coordinate system
A scalar (computing), an atomic quantity that can hold only one value at a time
Wikipedia does not have an article with this exact name. ... Wiktionary is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ... In mathematics, scalars are components of vector spaces (and modules), usually real numbers, which can be multiplied into vectors by scalar multiplication. ... Look up vector in Wiktionary, the free dictionary. ... Partial plot of a function f. ... In physics, a scalar is a simple physical quantity that does not depend on direction, and therefore does not depend on the choice of a coordinate system. ... In computing, a scalar is a variable or field that can hold only one value at a time; as opposed to composite variables like array, list, record, etc. ...
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A vector is a physical entity which has a magnitude which is a scalar, but in addition, in contrast with a scalar, has a direction.
The components of a vector as such are not scalars, since they change with a change of coordinate system; a scalarfield may however for one choice of the coordinate system be equal to a particular component.
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