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Re: Sorry. Its not bo....ks. D I Y
Posted by 'd-i-y71' on 15 Nov 2014 @ 14:52

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d-i-y71Joined: September 2009
Total Posts: 198
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Science for the simple mind (me
To lower the temperature of 1gm. of water 1degree C.we need to extract 1 calorie of heat energy from the gm of water. So to reduce the temp.of 1gm of water by 80 deg C we extract 80 cal. so the temp. of the gm. of water at 80 degC falls to 0 deg C. To freeze the gm of water ,now at 0deg .C we need to extract the 'Latent heat of fusion' at 80 cal. per gm. So we need to extract the same amount of heat (80 cal.)from the gm.at 0deg.C to freeze it as we did to cool it from 80 -0.
So we take hot water from the hot tap at 80C!! and cold from the cold tap at 10C and stick the 2 equal samples outside at -5C. The hot sample loses heat more quickly than the cold sample so the time to reach 0deg C is less than might be expected but still more than for the cold sample but both timesare 'dwarfed' by the time needed to extract the 'Latent heat' at a small temperature differential.So put simply hot water freezes less quickly than cold but the difference is nowhere near as great as 'one' might expect.

Message Thread:

WARNING all water cooled engines by 'dynamax' (06 Nov 2014 @ 10:01)

Re: WARNING all water cooled engines by 'alanrr' (06 Nov 2014 @ 10:27)

Re: WARNING all water cooled engines by 'OilyHerb' (06 Nov 2014 @ 20:02)

Re: WARNING all water cooled engines by 'alanrr' (06 Nov 2014 @ 23:16)

Re: WARNING all water cooled engines by 'PoppaAl' (07 Nov 2014 @ 7:57)

Re: WARNING all water cooled engines by 'SimonS' (07 Nov 2014 @ 10:43)

Windchill does not work like that. by 'JonWright' (07 Nov 2014 @ 11:07)

Re: Windchill does not work like that. by 'SimonS' (07 Nov 2014 @ 15:52)

Re: Windchill does not work like that. by 'alanrr' (07 Nov 2014 @ 18:49)

Re: Windchill does not work like that. by 'PaulMRotax' (07 Nov 2014 @ 20:47)

You must be missing Ian. by 'alanrr' (07 Nov 2014 @ 21:01)

Re: Windchill does not work like that. by 'dynamax' (07 Nov 2014 @ 23:54)

Re: Windchill does not work like that. by 'd-i-y71' (08 Nov 2014 @ 8:13)

D.I.Y.... you are wrong.... by 'itpro' (08 Nov 2014 @ 10:51)

Hello Ian, where did you spring from? by 'alanrr' (08 Nov 2014 @ 11:27)

Re: D.I.Y.... you could well be right by 'PaulMRotax' (08 Nov 2014 @ 13:47)

Sorry. That's bo....ks. by 'alanrr' (08 Nov 2014 @ 11:19)

Re: Sorry. That's bo....ks. by 'd-i-y71' (08 Nov 2014 @ 11:58)

Re: Sorry. That's bo....ks. by 'OilyHerb' (08 Nov 2014 @ 12:38)

Nah, you're ok diy, stay with us. nt by 'alanrr' (08 Nov 2014 @ 14:35)

Re: Sorry. That's bo....ks. D I Y by 'itpro' (09 Nov 2014 @ 0:46)

Re: Sorry. That's bo....ks. D I Y by 'd-i-y71' (10 Nov 2014 @ 8:39)

Re: Sorry. That's bo....ks. D I Y by 'BilandRacer9' (10 Nov 2014 @ 9:28)

Re: Sorry. That's bo....ks. D I Y by 'd-i-y71' (10 Nov 2014 @ 9:54)

Re: Sorry. That's bo....ks. D I Y by 'alanrr' (10 Nov 2014 @ 11:13)

Re: Sorry. Its not bo....ks. D I Y by 'dynamax' (12 Nov 2014 @ 18:43)

Re: Sorry. Its not bo....ks. D I Y by 'PaulMRotax' (12 Nov 2014 @ 22:20)

Re: Sorry. Its not bo....ks. D I Y by 'itpro' (13 Nov 2014 @ 1:13)

Re: Sorry. Its not bo....ks. D I Y by 'SimonS' (15 Nov 2014 @ 10:44)

Re: Sorry. Its not bo....ks. D I Y by 'itpro' (15 Nov 2014 @ 12:06)

Re: Sorry. Its not bo....ks. D I Y by 'd-i-y71' << You are here!

Re: Sorry. Its not bo....ks. D I Y by 'itpro' (15 Nov 2014 @ 17:12)

Re: Sorry. Its not bo....ks. D I Y by 'PaulMRotax' (15 Nov 2014 @ 20:52)

Re: Sorry. Its not bo....ks. D I Y by 'PaulMRotax' (15 Nov 2014 @ 17:13)

Re: Sorry. Its not bo....ks. D I Y by 'd-i-y71' (15 Nov 2014 @ 18:06)

Re: Sorry. Its not bo....ks. D I Y by 'PaulMRotax' (15 Nov 2014 @ 17:33)

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