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Dimensionless quantity
In dimensional analysis, a dimensionless quantity is a quantity to which no physical dimension is applicable. It is thus a bare number, and is therefore also known as a quantity of dimension one. Dimensionless quantities are widely used in many fields, such as mathematicsphysicsengineering, and economics. Numerous well-known quantities, such as , , and , are dimensionless. By contrast, examples of quantities with dimensions are lengthtime, and speed, which are measured in dimensional units, such as metersecond and meter/second.

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