dimensionless quantity
Sign in to saveAlso known as dimensionless parameter, quantity of dimension one, dimensionless physical quantity
quantity with no physical dimension
In the Vinony graph
Within Vinony's link graph, dimensionless quantity is referenced by 491 other articles, and connects out to statistics, unit of measurement and International Standard Serial Number.
It is catalogued under the topic Dimensionless quantities.
Its subject is documented across 43 Wikipedia language editions.
Key facts
- Common symbols
- N
- Si unit
- Unitless
via Wikipedia infobox
~10 min read
Encyclopedic overview
Dimensionless quantities, or quantities of dimension one, are quantities defined in a manner that prevents their aggregation into units of measurement. Typically expressed as ratios that align with another system, these quantities do not necessitate explicitly defined units. For instance, alcohol by volume (ABV) represents a volumetric ratio; its value remains independent of the specific units of volume used, such as in milliliters per milliliter (mL/mL). A characteristic number is a quantity of dimension one defined by a combination of quantities possibly involving multiplication and exponentiation, not just a division.
The number one is recognized as a dimensionless base quantity. Radians serve as dimensionless units for angular measurements, derived from the universal ratio of 2π times the radius of a circle being equal to its circumference.
Excerpted from Wikipedia’s “dimensionless quantity” article, available under the CC BY-SA 4.0 licence.