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From: ogden on 10 Feb 2010 09:01 Kevin Gleeson wrote: > On Wed, 10 Feb 2010 07:20:10 -0600, boots <boots(a)despammed.com> wrote: > > >On Wed, 10 Feb 2010 02:22:25 GMT in uk.rec.motorcycles, Kevin Gleeson > >says: > > > >>On Tue, 09 Feb 2010 18:52:38 -0600, boots <boots(a)despammed.com> wrote: > >> > >>> > >>>TBF I reckon it's more fun in dark cold water than warm blue water > >>>with loads of fish. If I had to give up one or the other it would be > >>>warm water diving that got the push. > >> > >>I agree. The waters off the East Coast of Tasmania for instance. Beats > >>the hell out of the Great Barrier Reef or Fiji for me. Yeah, you need > >>a semi-dry suit, but such a variety of experiences and clearer water > >>in general as well. Never got to go for a dive in UK, but water temp > >>would be similar, > > > >Not sure what it is in Tasmania. Current UK sea temperatures will be > >around 7 or 8 degrees in the south[1]. Viz is variable but probably > >averages at 3 or 4 metres, seen 30 plus a couple of times and also > >less than 30cm. Drysuit every time in the UK for me, unless I know the > >sea temp will be above 20, preferably 25 I'd take it to foreign as > >well these days. > > > >[1] Finished a course 2 weeks ago using inland sites 3 - 5 degrees. > >That was a tad too cool for me after a while. > > 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. The thing about pure, distilled water is you don't often come across quantities of it big enough to go diving in. -- ogden
From: doetnietcomputeren on 10 Feb 2010 09:00 On 2010-02-10 14:55:01 +0100, Kevin Gleeson <kevingleeson(a)imagine-it.com.au> said: >> [1] Finished a course 2 weeks ago using inland sites 3 - 5 degrees. >> That was a tad too cool for me after a while. > > 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? -- Dnc
From: Mick Whittingham on 10 Feb 2010 09:15 In article <e0f6f706d2f0ba18bdf401a1ebf4e35a(a)blakeley.plus.com>, boots <boots(a)despammed.com> writes >On Wed, 10 Feb 2010 02:22:25 GMT in uk.rec.motorcycles, Kevin Gleeson >says: > >>On Tue, 09 Feb 2010 18:52:38 -0600, boots <boots(a)despammed.com> wrote: >> >>> >>>TBF I reckon it's more fun in dark cold water than warm blue water >>>with loads of fish. If I had to give up one or the other it would be >>>warm water diving that got the push. >> >>I agree. The waters off the East Coast of Tasmania for instance. Beats >>the hell out of the Great Barrier Reef or Fiji for me. Yeah, you need >>a semi-dry suit, but such a variety of experiences and clearer water >>in general as well. Never got to go for a dive in UK, but water temp >>would be similar, > >Not sure what it is in Tasmania. Current UK sea temperatures will be >around 7 or 8 degrees in the south[1]. Viz is variable but probably >averages at 3 or 4 metres, seen 30 plus a couple of times and also >less than 30cm. Drysuit every time in the UK for me, unless I know the >sea temp will be above 20, preferably 25 I'd take it to foreign as >well these days. I took a 5.5 semi dry to dive New Zealand North island in November and December. > >[1] Finished a course 2 weeks ago using inland sites 3 - 5 degrees. >That was a tad too cool for me after a while. May I ask where? I helped out with student training in Gildenburgh one December[1]. Well down into the lower single digits. O'3 2-100 Ri Dry suit. [2] Ski thermals and Point below zero dive thermals. Chill guard on the mouth piece. Still COLD! [1] The only plus was excellent vis. Yes I did say Gildenburgh [2] The Dog's Cojones > > > -- Mick Whittingham 'and I will make it a felony to drink small beer.' William Shakespeare, Henry VI part 2.
From: Kevin Gleeson on 10 Feb 2010 09:23 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 ><kevingleeson(a)imagine-it.com.au> said: > >>> [1] Finished a course 2 weeks ago using inland sites 3 - 5 degrees. >>> That was a tad too cool for me after a while. >> >> 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. Not sure whether the same is at the other end (ie 100C) but as I am fucked if I am going to dive in boiling water, I really haven't researched that end :-)
From: Mark Olson on 10 Feb 2010 09:34
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 |