dimensionless quantity

Quantity with no physical dimension

Also known as dimensionless parameter · quantity of dimension one · dimensionless physical quantity

Instance of: general quantity
Subclass of: individual quantity

Overview

From Wikipedia, the free encyclopedia · Read full article · Text CC BY-SA 4.0

Dimensionless quantities, or quantities of dimension one, are quantities with no associated units of measurement. These may be ratios of quantities with the same physical units or ratios of dimensionally equal products with identical 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). The International Organization for Standardization calls a physical quantity with units of 'one' a characteristic number.

Overview

All data

17 statements · 24% with external sources · numbers in brackets are citations

Different from: dimensionless unit
physical quantity
ISQ dimension: 1
Recommended unit of measurement: dimensionless unit
Union of: list of values as qualifiers list item: number of entities, ratio of two quantities of the same kind

On other databases

12 identifiers linking dimensionless quantity across the web's reference databases

Data quality

statements

24%

externally sourced

Source last edited October 5, 2026. AIDB refreshes this page daily.

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AIDB. (2026). dimensionless quantity (Q126818). Retrieved from https://aidb.si/e/dimensionless-quantity-Q126818