Talk:Water

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Uh, why? Deletion will probably be speedy... since there's already a "fun:water" article. merging should occur before deletion, if at all...? human^{be in} 02:12, 17 September 2007 (EDT)

From what I recall, water, H₂O, does not exist as a single entity but is a diatomic molecule, hence 2H₂O. CЯacke® 16:06, 17 September 2007 (EDT)

That's why I wrote "one molecule", to make it clear. What does "diatomic molecule" mean? To me that says something like H₂ - most gases are diatomic molecules. Water is triatomic, isn't it? And, sure, one molecule does not "water" make, but it is the smallest unit of the compound. ("Diatomic molecules are molecules made only of two atoms") human^{be in} 16:14, 17 September 2007 (EDT)

Okie doke. I remember being learned, "H2O is wrong it should be 2H2O". What you have is right in that the smallest unit of water is H2O, though it almost never actually exists that way. CЯacke® 16:19, 17 September 2007 (EDT)

I'd just like to see a source on that, and we can add it as a section. Does this mean that in a very rarifed "atmosphere" of just water moelcules in a vacuum, they bunch up into pairs? Or something like that? human^{be in} 18:22, 17 September 2007 (EDT)

BTW

I found out by accident that if you're using firefox and hit reload whilst holding down the shift key it'll up the "page accessed" numbers, (clears the cache or somesuch), (okay we all knew that already),but you don't have to wait for it to actually reload. As fast as your stubby index finger can click reload it counts as a new hit. CЯacke® 16:30, 17 September 2007 (EDT)

Dihydrogen oxide poisoning

No mention of this frequent occurrence.

Why not? 82.44.143.26 (talk) 15:37, 6 May 2010 (UTC)

If you mean "drowning", it's not technically poisoning. If you mean wp:Water intoxication or wp:Hyponatremia, it's not frequent. Anyway, adding it is a good idea.--ZooGuard (talk) 15:55, 6 May 2010 (UTC)

Woo

We probably need to add a Water Woo section. All this 8 pints a day, chemically balanced, magnetised or quantumised rubbish.  Lily ^{Inspirate me.} 16:04, 6 May 2010 (UTC)

I've been putting off writing an 8-pints-a-day article for lack of titletascticality. This'd be a good place for it. Totnesmartin (talk) 16:28, 6 May 2010 (UTC)

Water woo ^{Scienceblogs Hat tip}. Could also do with something about bottled water sales. 16:35, 13 August 2010 (UTC)

Dideturium oxide

How much heavier in practice is D2O to H2O? (How easily would the passing spy be able to choose the correct bottle of water in the fridge?) 212.85.6.26 (talk) 16:42, 21 January 2011 (UTC)

The spy would be able to choose it "easily" only if s/he is a rat: http://en.wikipedia.org/wiki/Heavy_water --ZooGuard (talk) 16:57, 21 January 2011 (UTC)

'Protons and neutrons' of H2O amount to 20, and D20 to 22 - would heavy water be one tenth more heavy? (The containers can be factored out)

Yes, although 18 and 20 respectively. The A_r of oxygen is ~16. H₂O has an M_r of 18 and D₂O has an M_r of 20. This makes D₂O more dense, about ~1.1 g/ml compared to water, which is defined as 1.0 g/ml. So yeah, the same volume will be 10% heavier. ^theist 18:33, 27 January 2011 (UTC)

An associated question. I was having a bit of an argument the other day. Would there be any difference in weight between a pint of wine and a pint of water. I said there would, as the wine would be, say, 13% alcohol with the rest being (mostly) water. Presumably a given volume of water and a given volume of alcohol would have different weights. My opponents insisted they would weigh the same. Anybody got any ideas?--Bob^{Spring is sprung!} 18:49, 27 January 2011 (UTC)

Yes. Indeed there is (well, used to be as they've changed the course this year) an undergraduate experiment here where you used density measurements to determine the percentage content of two particular substances. And in that case they were far more similar than water and alcohol. Density of ethanol is 0.789 g/ml (water, again, is 1.0 g/ml), so it would actually weigh a little less. At least to a first approximation; molecular interactions (particularly with the water-ethanol azeotrope) mean the relationship is quite non-linear. If you were accurate enough, it would be noticable. ^theist 18:57, 27 January 2011 (UTC)

Cool. Thanks.--Bob^{Spring is sprung!} 19:01, 27 January 2011 (UTC)

Even better (:P) here's the conversion table. ^theist 19:10, 27 January 2011 (UTC)

Mmmm. Even cooler. :-)--Bob^{Spring is sprung!} 19:13, 27 January 2011 (UTC)

How do the densities of H2O and D2O differ and how would this affect the weight of 'the WWII agent's milkbottle of heavy water'? (and how much stronger would the modern 4 litre cardboard container have to be) 212.85.6.26 (talk) 16:01, 18 February 2011 (UTC)

Density = mass/volume. If it is 10% more massive by volume, then it is 10% denser. I wouldn't say it should be that much harder, as milk is denser than water, and it is in cardboard all the time.Тy^Talk. 16:04, 18 February 2011 (UTC)