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dimensionless number
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- A number representing a property of a physical system, but not measured on a scale of physical units (as of time, mass, or distance). Drag coefficients and stress, for example, are measured as dimensionless numbers.
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Example Sentences
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The Deborah number is an example of a dimensionless number: Since we divide one time period by another, the ratio does not have any unit.
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The point of this laborious procedure is that this combination of multiplication and division produces a pure, dimensionless number.
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In physics there is a dimensionless number, the reciprocal of the fine structure constant, whose value to the best of our experimental knowledge is 137.035999679 with an uncertainty of 94 in the final two digits.
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