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The 21 pages that link to Dimensionless quantity, each with the reason it gives.

• Dimensional analysisRelated: Dimensionless products are the variables used in many dimensional-analysis results.

• RadianRelated: Arc length divided by radius cancels units, although radians remain a named SI unit.

• Equilibrium constantRelated: Thermodynamic equilibrium constants are dimensionless, unlike some concentration-based approximations.

• Unit of measurementCompared with: It needs no unit because it compares quantities of the same kind.

• Natural unitsNarrower topic: Natural units simplify dimensions but do not make every physical quantity dimensionless.

• Physical quantityCompared with: It remains a quantity even though its unit expression reduces to one.

• Standard stateRelated: Thermodynamic activities are dimensionless ratios defined using standard-state conventions.

• Mass fractionRelated: Both masses use the same units, so their quotient has none.

• OneRelated: Dimensionless values can equal one when compared quantities balance exactly.

• Scale invarianceRelated: Dimensionless quantities can compare behavior across systems with different characteristic scales.

• SteradianCompared with: A steradian has dimension one, yet SI retains its named unit to identify solid angle.

• Constant (mathematics)Related: Many mathematical and physical constants are pure numbers independent of unit choice.

• Fresnel numberRelated: Matching units in the ratio makes the Fresnel number independent of measurement units.

• International System of QuantitiesRelated: It shows that a dimensionless quantity can remain distinct from a plain number.

• Radian per secondRelated: The radian is dimensionless, so angular velocity has dimension inverse time.

• Curie's lawRelated: In SI, volume magnetic susceptibility is dimensionless, while Curie constant units depend on its convention.

• Mathematical constantRelated: Constants such as π are dimensionless, while physical constants can carry units.

• NeperNarrower topic: Although assigned the symbol Np, the neper expresses a dimensionless logarithmic ratio.

• Buckingham π theoremRelated: The theorem expresses the original relation through dimensionless quantities.

• Inverse secondCompared with: Cycles and radians can be dimensionless, but their rates still carry inverse-time dimensions.

• Parts-per notationRelated: A parts-per value is a scaled ratio, not a unit of physical dimension.