In Physics, a dimensionless quantity or a bare number or pure number is a quantity to which no physical dimension is assigned. These quantities are often treated within the field of dimensional analysis. It was only in the nineteenth century that Joseph Fourier (French Mathematician) and James Clerk Maxwell (Scottish Physicist) made significant developments in the modern concepts of dimension and unit. For any dimensionless quantity, its corresponding unit of measurement in the SI is one or not represented at all. Certain universal dimensioned physical constants, such as the speed of light in a vacuum, the universal gravitational constant, Planck's constant, Coulomb's constant, and Boltzmann's constant can be normalized to 1 if appropriate units for time, length, mass, charge, and temperature are chosen. The International Committee for Weights and Measures, in the early 2000s, discussed naming the unit of 1 as the "uno", but the idea of just introducing a new SI-name for 1 was dropped.

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