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1. Vectors and scalars
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A scalar is a real number. (Sometimes it will be useful to allow complex numbers as well.) Examples: mass, volume, temperature, density, electric charge, work, etc. It is always possible to multiply a vector by a scalar but in general you cannot add a vector and a scalar. The length of a vector is a scalar.
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© 2002-09 The University of Sydney. Last updated: 09 November 2009
ABN: 15 211 513 464. CRICOS number: 00026A. Phone: +61 2 9351 2222.
Authorised by: Head, School of Mathematics and Statistics.
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