VOOZH about

URL: https://en.wikipedia.org/wiki/ISO_31-3

⇱ ISO 31-3 - Wikipedia

Jump to content
From Wikipedia, the free encyclopedia
Standard for names and symbols
This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages)
The topic of this article may not meet Wikipedia's general notability guideline. Please help to demonstrate the notability of the topic by citing reliable secondary sources that are independent of the topic and provide significant coverage of it beyond a mere trivial mention. If notability cannot be shown, the article is likely to be merged, redirected, or deleted.
Find sources: "ISO 31-3" – news · newspapers · books · scholar · JSTOR (January 2025) (Learn how and when to remove this message)
This article relies largely or entirely on a single source. Relevant discussion may be found on the talk page. Please help improve this article by introducing citations to additional sources.
Find sources: "ISO 31-3" – news · newspapers · books · scholar · JSTOR (January 2025)
This article relies excessively on references to primary sources. Please improve this article by adding secondary or tertiary sources.
Find sources: "ISO 31-3" – news · newspapers · books · scholar · JSTOR (January 2025) (Learn how and when to remove this message)
(Learn how and when to remove this message)

ISO 31-3 is the part of international standard ISO 31 that defines names and symbols for quantities and units related to mechanics. It was published on 27 August 1992 and withdrawn on 17 March 2006 due to being superseded by ISO 80000-4.[1]

Its definitions include (note boldfaced symbols mean quantity is a vector):

Quantity Unit Remarks
Name Symbol Name Symbol Definition
Force F newton N 1 N = 1 kg·m/s2 Unit named after Isaac Newton
Moment of force, Torque M, 👁 {\displaystyle {\boldsymbol {\tau }}}
 		N·m 1 N·m = 1 kg·m2/s2 The unit is dimensionally equivalent to the units of energy, the joule; but the joule should not be used as an alternative for the newton metre.
Linear momentum p kg·m/s or N·s
(Linear) impulse J N·s or kg·m/s
Angular momentum L kg·m2/s or N·m·s
Mechanical energy, Work E, W joule J 1 J = 1 kg·m2/s2 = 1 Pa·m3 = 1 W·s Unit named after James Joule. The joule is dimensionally equivalent to the units of torque and moment of force but should be used in preference to the newton metre (N·m).
Power P watt W 1 W = 1 J/s = 1 N·m/s = 1 kg·m2/s3 Unit named after James Watt.
Pressure p pascal Pa 1 Pa = 1 N / m2 = 1 kg/(m·s2) Named after Blaise Pascal.
Normal stress, Shear stress 👁 {\displaystyle \sigma ,\tau }
 		pascal Pa 1 Pa = 1 N / m2 = 1 kg/(m·s2) Named after Blaise Pascal.
...

References

[edit]
  1. ^ "ISO 31-3:1992". ISO. Retrieved 2025-01-25.
1–9999
10000–19999
20000–29999
30000+


👁 Stub icon

This physics-related article is a stub. You can help Wikipedia by adding missing information.

👁 Stub icon

This standards- or measurement-related article is a stub. You can help Wikipedia by adding missing information.

Categories:
Hidden categories: