KnowraDimensionless quantityLinked fromLinked fromThe 21 pages that link to Dimensionless quantity, each with the reason it gives.All 21Related 15Narrower topic 2Compared with 4Unit of measurementCompared with: It needs no unit because it compares quantities of the same kind.Physical quantityCompared with: It remains a quantity even though its unit expression reduces to one.SteradianCompared with: A steradian has dimension one, yet SI retains its named unit to identify solid angle.Inverse secondCompared with: Cycles and radians can be dimensionless, but their rates still carry inverse-time dimensions.