Dimensionless quantity - Revision history

Karl Jones: /* External links */

2016-04-22T01:19:32Z

‎External links

Karl Jones at 12:30, 8 February 2016

2016-02-08T12:30:15Z

Karl Jones: /* See also */

2016-02-08T12:27:44Z

‎See also

Karl Jones: /* Description */

2016-02-08T12:27:34Z

‎Description

Karl Jones: Created page with "In dimensional analysis, a '''dimensionless quantity''' is a quantity to which no physical dimension is applicable. It is thus a bare number, and is therefore also known..."

2016-02-08T12:27:14Z

Created page with "In dimensional analysis, a '''dimensionless quantity''' is a quantity to which no physical dimension is applicable. It is thus a bare number, and is therefore also known..."

New page

In [[dimensional analysis]], a '''dimensionless quantity''' is a quantity to which no physical dimension is applicable.

It is thus a bare number, and is therefore also known as a quantity of dimension one.

== Description ==

Dimensionless quantities are widely used in many fields, including:

* [[Mathematics]]
* [[Physics
* [[Engineering]]
* [[Economics]]

Well-known dimensionless quantities include:

* [[π]]
* [[e]]
* [[φ]]

== Cancellation of dimensionless and not-dimensionless ==

Dimensionless quantities are often obtained as products or ratios of quantities that are not dimensionless, but whose dimensions cancel in the mathematical operation.

This is the case, for instance, with the engineering strain, a measure of deformation. It is defined as change in length, divided by initial length, but because these quantities both have dimensions L (length), the result is a dimensionless quantity.

== Quantities with dimensions ==

By contrast, examples of quantities with dimensions are [[length]], [[time]], and [[speed]], which are measured in dimensional units, such as meter, second and meter/second.

== See also ==

* [[Dimensional analysis]]
* [[Economics]]
* [[Engineering]]
* [[Mathematics]]
* [[Physics

== External links ==

* [https://en.wikipedia.org/wiki/Dimensionless_quantity Dimensionless quantity] @ Wikipedia

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 Dimensionless quantities are often obtained as products or ratios of quantities that are not dimensionless, but whose dimensions cancel in the mathematical operation.
-This is the case, for instance, with the engineering strain, a measure of deformation. It is defined as change in length, divided by initial length, but because these quantities both have dimensions L (length), the result is a dimensionless quantity.
+This is the case, for instance, with the [[engineering strain]], a measure of [[deformation]]. It is defined as change in length, divided by initial length, but because these quantities both have dimensions L (length), the result is a dimensionless quantity.
 == Quantities with dimensions ==
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 * [[Mathematics]]
 * [[Physics]]
 == External links ==
 * [https://en.wikipedia.org/wiki/Dimensionless_quantity Dimensionless quantity] @ Wikipedia