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From: 'Hog on 10 Feb 2010 10:15 Switters wrote: > On Wed, 10 Feb 2010 13:20:10 GMT, boots wrote: > >> Current UK sea temperatures will be >> around 7 or 8 degrees in the south > > Feels colder at the moment[1]. I was in it[2] at the weekend and it > feels the coldest it has been for a number of years. > > [1] I don't think it actually is colder than 7C, it just feels it. > [2] South West Cornwall Lunatic. -- Hog
From: Catman on 10 Feb 2010 10:17 Mark Olson wrote: > Kevin Gleeson wrote: >> On Wed, 10 Feb 2010 08:34:46 -0600, Mark Olson <olsonm(a)tiny.invalid> >> wrote: >> >>> Kevin Gleeson wrote: >>>> On Wed, 10 Feb 2010 15:00:58 +0100, doetnietcomputeren >>>> <doesnotcompute(a)gmail.com> wrote: >>>> >>>>> On 2010-02-10 14:55:01 +0100, Kevin Gleeson >>>>>> Oh - btw, 3 degree water doesn't exist unless someone added >>>>>> alcohol to >>>>>> it. It stops at 4C then the next phase change is ice. >>>>> What? Surely the freezing point of normal water is 0 degrees C, and >>>>> lower still for salt water? >>>> Nope there is a point where it has to drop energy to go through the >>>> phase change to ice. I don't have links and can't be arsed looking, >>>> but seawater will only go to 4C. Th energy to do the phase change is >>>> worth those other 3C. Google it. I'm sure it is out there somewhere. >>> You are confused. Fresh water freezes at 0C, sea water at less than >>> zero C. This link has a likely explanation of your 4C confusion. >>> >>> http://www.tpub.com/content/aerographer/14269/css/14269_62.htm >> >> Fair call, I was going on 30 year old dive training memory and was >> told that you couldn't dive in water less then 4C as it didn't exist. >> Your explanation there is more succinct but still gives the same >> result. There is still that phase change at 4C ( and that article >> explains that the change is rapid), but my memory (or people's >> understanding of it when I was doing physics and dive training) still >> means you are unlikely to dive in water under 4C. > > The simple fact is fresh water does indeed freeze at 0C and not 4C. > Sea water freezes at some lower temperature depending on the salinity. > There is no phase change at 4C. "Phase change" has a specific meaning. > > There is, if memory serves, a re-arrangement of liquid molecules in the water that occurs at adn below 4C which accounts for the density of ice being less than that of liquid H2O (generally)? -- Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3 Tyger, Tyger Burning Bright (Remove rust to reply) 116 Giulietta 3.0l Sprint 1.7 GTV TS GT 3.2 V6 Triumph Sprint ST 1050: It's blue, see. www.cuore-sportivo.co.uk
From: Wicked Uncle Nigel on 10 Feb 2010 10:21 Using the patented Mavis Beacon "Hunt&Peck" Technique, Catman <catman(a)rustcuore-sportivo.co.uk> typed >> >There is, if memory serves, a re-arrangement of liquid molecules in the >water that occurs at adn below 4C which accounts for the density of ice >being less than that of liquid H2O (generally)? <http://www.newscientist.com/article/mg20527466.200-the-strangest-liquid- why-water-is-so-weird.html> -- Wicked Uncle Nigel - "He's hopeless, but he's honest" "Environmentally, it is our duty to re-use our plastic bags. To suffocate our children" - Frankie Boyle.
From: Catman on 10 Feb 2010 10:31 Wicked Uncle Nigel wrote: > Using the patented Mavis Beacon "Hunt&Peck" Technique, Catman > <catman(a)rustcuore-sportivo.co.uk> typed >>> >> There is, if memory serves, a re-arrangement of liquid molecules in >> the water that occurs at adn below 4C which accounts for the density >> of ice being less than that of liquid H2O (generally)? > > <http://www.newscientist.com/article/mg20527466.200-the-strangest-liquid- > why-water-is-so-weird.html> > Ooh, ta. -- Catman MIB#14 SKoGA#6 TEAR#4 BOTAFOF#38 Apostle#21 COSOC#3 Tyger, Tyger Burning Bright (Remove rust to reply) 116 Giulietta 3.0l Sprint 1.7 GTV TS GT 3.2 V6 Triumph Sprint ST 1050: It's blue, see. www.cuore-sportivo.co.uk
From: Wicked Uncle Nigel on 10 Feb 2010 10:35
Using the patented Mavis Beacon "Hunt&Peck" Technique, Catman <catman(a)rustcuore-sportivo.co.uk> typed >Wicked Uncle Nigel wrote: >> Using the patented Mavis Beacon "Hunt&Peck" Technique, Catman >><catman(a)rustcuore-sportivo.co.uk> typed >>>> >>> There is, if memory serves, a re-arrangement of liquid molecules in >>>the water that occurs at adn below 4C which accounts for the density >>>of ice being less than that of liquid H2O (generally)? >> >><http://www.newscientist.com/article/mg20527466.200-the-strangest-liqui>>d- >> why-water-is-so-weird.html> >> > >Ooh, ta. De nada. By a curious coincidence I was reading that on the shitter this very morning. -- Wicked Uncle Nigel - "He's hopeless, but he's honest" "Environmentally, it is our duty to re-use our plastic bags. To suffocate our children" - Frankie Boyle. |