Talk:Water

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Former good article Water was one of the Natural sciences good articles, but it has been removed from the list. There are suggestions below for improving the article to meet the good article criteria. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.
Article milestones
Date Process Result
September 17, 2004 Peer review Reviewed
December 16, 2005 Good article nominee Listed
August 31, 2007 Good article reassessment Delisted
Current status: Delisted good article
edit·history·watch·refresh Stock post message.svg To-do list for Water:
  • Article's purpose: Water's importance for life and humanity.
    • rewrite with purpose in mind (what is wrong with it now? has this been discussed?)
      • Discuss the dangers of water, including brief discussion of reactive properties and include its NFPA diamond (http://en.wikipedia.org/wiki/NFPA_704).
      • Expand appropriate short statements into full paragraph.
    • re-organization toward this purpose
    • missing topics within scope
      • Add a section on water-based power (hydroelectric, wave, tidal etc).
      • Water on other planets
    • consider deletions with this purpose in mind
    • spin-off topics tangential to scope
    • change types of water to forms of water.
      • please include the role of comets and meteors in bringing water to earth
    • add reference http://pages.jh.edu/news_info/news/home98/apr98/clouds.html Axisor (talk) 08:30, 5 October 2014 (UTC)


Removed superfluous figures[edit]

Spider web Luc Viatour.jpg

For lack of space, removed the dew-on-spiderweb photo at right and its caption "Dew drops adhering to a spider web." --Jorge Stolfi (talk) 06:44, 28 September 2016 (UTC)

Label for dangerous goods - class 4.3.svg

Also removed the the hazard label figure at right (which was commented out in the source) and its caption "ADR label for transporting goods dangerously reactive with water". --Jorge Stolfi (talk) 06:44, 28 September 2016 (UTC)

universal solvent[edit]

especially from biological point of view the notion of "universal solvent" is underlined in every introductory biology book. here is just one source: usgs.gov. indeed wiki has a redirection page [Universal_solvent] which mentions water. So I guess it should be mentioned here at least. Moreover I think it should be emphasized with a paragraph. "Water is a good solvent for a wide variety of chemical substances;" the phrase 'good solvent' is misleading I think --aruz (talk) 22:35, 28 October 2016 (UTC)

Semi-protected edit request on 22 December 2016[edit]

At the end of the first paragraph, in the sentence: "It also occurs in nature as snow, glaciers, ice packs and icebergs, clouds, fog, dew, aquifers, and atmospheric humidity.", the words "ice packs" refer to this page: https://en.wikipedia.org/wiki/Drift_ice

However, the link leads a user to this page: https://en.wikipedia.org/wiki/Ice_pack

This certainly does not make sense as the sentence lists all the formations of water found in NATURE and plastic bags filled with refrigerant gels are no usually found in nature. Please, correct the links.

Thank you and have a nice day,

Revan Rangotis Revanchist317 (talk) 17:29, 22 December 2016 (UTC)

 Done. Thanks for bringing this up. I fixed the link. JudgeRM (talk to me) 17:31, 22 December 2016 (UTC)

External links modified[edit]

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Factually incorrect claims.[edit]

In the Chemical and physical properties/States section, several factually false claims are made.
1. "Water also differs from most liquids in that it becomes less dense as it freezes." The density of water at 1 atm. pressure has a maximum at 3.98°C. Between 100°C and 4°C is does NOT become "less dense" (at 1 atm.). At 200 atm. there is decrease in density of liquid water with decreasing temperature - the maximum in the liquid state disappears and the solid state is asymptotically denser (i.e. the density curve is monotonic & decreasing over its entire liquid range at these relatively high pressures (the maximum disappears between 75 & 100 atm.)).
2."The maximum density of water is 1,000 kg/m3 (62.43 lb/cu ft), that occurs at 3.98 °C (39.16 °F),..." The density of water continues to increase with pressure. At 10 GPa the density is approximately 2400 kg/m3. Also, where the maximum occurs depends on pressure.
3."... the density of ice is 917 kg/m3 (57.25 lb/cu ft)." This is only true at (and near and below) 1 atm.
4."Thus, water expands 9% in volume as it freezes, which accounts for the fact that ice floats on liquid water." Only near 1 atm.
5."At temperatures from 30 °C to 60 °C water has 2 liquid states.[13][14][15]" The references cited contain two different claims. One claims that water on time scales of ~1 ns and spatial scales of ~1 nm can be characterized as having two distinct structures. The reference is to the primary literature, and the claim is controversial (as is noted in the paper itself). I have no opinion on whether or not two "structures" exist, but the cited reference does not claim that these exist at timescales long enough to have relevance to the discussion of the phases of water. That is, it is a red herring, even if it is correct. The other two references state that for some of the physical properties of water, the rate of their change with temperature changes somewhere between 40° and 60°C (that is dx/dt is linear but the slope changes around 50°C for various properties x). Neither reference claims that water exists in a state which is different at 20°C (or 1°C !) than its state at 70°C (or 99°C) {at 1 atm.}.
The first 4 problems can be fixed by qualifying pressure at or near 101 kPa (1 atmosphere), although it might be useful to mention the fact that the maximum disappears by 100 atm. (and perhaps even to point out that density at extreme pressures Mega and Giga Pascals are typically much higher than between 0 and 1000 atm. (Water at 0° and 200 atm has a density of 1010 kg/m^3).) The 5th problem is more difficult. The structure of water has yet to be fully determined, but there is a vast difference between the electronic and atomic effects at the nanoscale and the phases of water on the macroscale. And note that this article is specifically not about the H2O molecule. If atomic/molecular level details are appropriate here (I'd argue that they're not appropriate), then they should be placed in context. A change in the slope of the lines of various properties vs temperature do not prove different state (the clearest demonstration of this is the monotonic (but nonlinear) decrease of viscosity with increasing temperature), although the change suggests that some fundamental structural change is occurring (it may be statistical or quantitative rather than qualitative however). I think that is far beyond the scope of this article.67.140.179.46 (talk) 20:07, 26 June 2017 (UTC)

This is a primarily non-technical article, atmospheric pressure should be assumed if nothing contrary is stated. There are a few awkward wordings in the article; I'll do an editing pass at some point this week. Power~enwiki (talk) 20:16, 26 June 2017 (UTC)

rain[edit]

please add rain to the first paragraph of the article, with clouds and snow. — Preceding unsigned comment added by 210.235.108.50 (talk) 22:49, 7 August 2017 (UTC)