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This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Scalar_(physics)


00:00:52 1 Scalar field
00:01:18 2 Physical quantity
00:02:20 3 Non-relativistic scalars
00:02:30 3.1 Temperature
00:03:12 3.2 Other examples
00:04:19 4 Relativisic scalars
00:05:18 5 See also



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SUMMARY
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A scalar or scalar quantity in physics is a physical quantity that can be described by a single element of a number field such as a real number, often accompanied by units of measurement. A scalar is usually said to be a physical quantity that only has magnitude and no other characteristics. This is in contrast to vectors, tensors, etc. which are described by several numbers that characterize their magnitude, direction, and so on.
The concept of a scalar in physics is essentially the same as in mathematics. Formally, a scalar is unchanged by coordinate system transformations. In classical theories, like Newtonian mechanics, this means that rotations or reflections preserve scalars, while in relativistic theories, Lorentz transformations or space-time translations preserve scalars.