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The process of measurement involves estimating the ratio of the magnitude of a quantity to the magnitude of a unit of the same type (length, time, mass, etc.). A measurement is the result of such a process, expressed as the product of a real number and a unit, where the real number is the estimated ratio. An example is 9 metres, which is an estimate of an object's length relative to a unit of length, the metre. Unlike a count, or integer quantity of items that is known exactly, every measurement is an estimate that has some uncertainty.
- A measurement is a comparison to a standard. -- William Shockley
- By number we understand not so much a multitude of Unities, as the abstracted Ratio of any Quantity to another Quantity of the same kind, which we take for Unity. -- Sir Isaac Newton (1728)
Units, Measurements and Theory of Errors - Concepts ans Problems http://www.orkut.co.in/Main#FavoriteVideos?uid=2219516340934088758
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Units, Measurements and Theory of Errors - Concepts ans Problems http://www.orkut.co.in/Main#FavoriteVideos?uid=2219516340934088758
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