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How does one categorize materials such as sugar or grain, which in bulk have very fluid-like behaviors? A very large number of plastic beads or metal ball-bearings would behave exactly like a fluid. D e nni ☯ 23:22, 27 June 2006 (UTC)
A fluid is defined as a substance that continually deforms (flows) under an applied shear stress. All liquids and all gases are fluids.
^^ This does not apply to some classes of non-newtonian fluids. (i.e. Bingham plastics).
Removed: notion of deformation under a shear stress regardless of how small the applied stress is. This is 100% untrue.
More generally, the stress is a function of the rate of change of deformation, rather than a function of the deformation itself. Removed 'no matter how small' from the article as a start, as mentioned above, fluids (i.e. Bingham) may have a yield stress. — Preceding unsigned comment added by Oddbodbloke ( talk • contribs) 11:21, 26 November 2011 (UTC)
This article needs a rewrite as several parts of it are rather confusing. Please refer to the Rheology article, in which the definitions are much clearer. LouisBB ( talk) 14:45, 4 November 2008 (UTC)
There is another fluid. An art piece by Allan Kaprow called Fluids, done in 1967 in Los Angeles. There ought to be a page about that. —Preceding unsigned comment added by 24.184.156.70 ( talk) 04:00, 23 March 2010 (UTC)
There are glaring mistakes in the introduction:
'Fluids are a subset of the phases of matter and include only liquids' This is not true. Fluids include both liquids and gases.
'Although the term "fluid" includes in common usage, "fluid" is often used as a synonym for "liquid", with no implication that gas could also be present.' This sentence is lacking the word "gases" after the word "includes". — Preceding unsigned comment added by 164.143.244.33 ( talk) 18:21, 5 February 2013 (UTC)
Which substances are included in "fluid" (and what is not) greatly differ among scientific domains. But it seems there is one thing in common: "fluid" is a term of generalisation in each domain, when an older term does not fit to some objects of interest.