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IWETHEY Home / IWETHEY Board / Open Forum / cheap science experiment
Post #96,605
by boxley
4/14/03 10:38:32 PM
Reply
New cheap science experiment
place boiling water in ice cube tray alongside another tray of cold tap water, report back on which freezes first along with an essay on transference,
thanx,
bill
will work for cash and other incentives [link|http://home.tampabay.rr.com/boxley/resume/Resume.html|skill set]

questions, help? [link|mailto:pappas@catholic.org|email pappas at catholic.org]

Carpe Dieu
Post #96,610
by Another Scott
4/14/03 11:10:40 PM
Reply
New It's different in pipes apparently.
At least according to [link|http://www.gi.alaska.edu/ScienceForum/ASF4/440.html|this] discussion of water freezing in pipes. In an open container, [link|http://www.gi.alaska.edu/ScienceForum/ASF6/650.html|this] discussion of water freezing in a cup, they say that it depends on the environment the water is in:

I never put much credence into these claims until I started reading different accounts of the phenomenon. Most recently, the distinguished scientist and author, Isaac Asimov, in his Book of Facts (Red Dembner Enterprises Corp., 1981), flatly states in one of his "3000 facts," that "Water freezes faster if it is cooled rapidly from a relatively warm temperature than if it is cooled at the same rate from a lower temperature."

This may be true, but only under certain circumstance. Dr. T. Neil Davis (editor of this column from 1976 to 1981) performed his own experiments, and found that only when he used Styrofoam cups at temperatures near zero, did warm water freeze first.

Under almost any other circumstance, especially those which allowed heat to escape through the sides of the container, such as from a metal cup, the colder water froze first.

Insulation being taken into account, we can now attribute the hot water freezing first to the fact that, in hot water, circulation currents move faster, exposing more water to the air, and resultant evaporation (hence, cooling) occurs at a greater rate. Also, boiling the water before exposure to frigid temperatures removes the dissolved air which inhibits freezing in the colder water.


Nothing's simple... :-)

Cheers,
Scott.
     Doing my part for the economy - (cwbrenn) - (50) - April 11, 2003, 01:58:45 PM EDT
         *cheer* -NT - (imric) - April 11, 2003, 02:02:04 PM EDT
         14 rooms, lets all go to Albany for vacation! luck -NT - (boxley) - (15) - April 11, 2003, 03:02:13 PM EDT
             Half are closets ;-) - (jbrabeck) - (14) - April 11, 2003, 03:51:01 PM EDT
                 hehe. - (cwbrenn) - (10) - April 11, 2003, 05:12:34 PM EDT
                     Sounds like a dream frat-house, actually. - (static) - (9) - April 12, 2003, 02:06:33 AM EDT
                         Oh, I have a "virtual tour" :) - (cwbrenn) - (8) - April 12, 2003, 12:06:16 PM EDT
                             Re: Oh, I have a "virtual tour" :) - (rcareaga) - (3) - April 12, 2003, 12:26:21 PM EDT
                                 Not impertinent - (cwbrenn) - (2) - April 12, 2003, 12:45:35 PM EDT
                                     new things to learn, zone valves stair avoidance, looks good -NT - (boxley) - April 12, 2003, 02:01:21 PM EDT
                                     "Possessions will fit any available space"? :-) -NT - (static) - April 14, 2003, 08:26:37 AM EDT
                             Nice tour! - (a6l6e6x) - April 13, 2003, 12:36:07 AM EDT
                             Hey, not bad. - (static) - April 14, 2003, 08:39:07 AM EDT
                             Chris... - (folkert) - (1) - April 14, 2003, 08:58:17 AM EDT
                                 There will be cleaning up :) - (cwbrenn) - April 14, 2003, 03:13:34 PM EDT
                 Don't be stupid - (tuberculosis) - (2) - April 12, 2003, 02:56:28 PM EDT
                     recovering old house victim? - (rcareaga) - (1) - April 12, 2003, 08:44:47 PM EDT
                         Old stuff lasts longer... - (kmself) - April 12, 2003, 11:12:15 PM EDT
         Wow, envy! - (deSitter) - (3) - April 11, 2003, 03:07:38 PM EDT
             Err...Ross... - (jb4) - (2) - April 11, 2003, 05:25:55 PM EDT
                 Haven't seen Spinal Tap Yet :/ - (deSitter) - (1) - April 11, 2003, 11:24:23 PM EDT
                     It's a LPRDism too. No excuses. ;-) -NT - (Another Scott) - April 12, 2003, 09:21:23 AM EDT
         A friend used to call that inserting a needle attached to... - (a6l6e6x) - (28) - April 11, 2003, 08:27:07 PM EDT
             House already inspected - (cwbrenn) - (27) - April 11, 2003, 10:26:22 PM EDT
                 Good to know - (Silverlock) - April 11, 2003, 10:49:29 PM EDT
                 Very good! Good luck with it! -NT - (a6l6e6x) - April 11, 2003, 10:52:31 PM EDT
                 Re: House already inspected - (deSitter) - (3) - April 11, 2003, 11:28:55 PM EDT
                     we'll have plenty of room to put you up :) - (cwbrenn) - (2) - April 12, 2003, 12:24:04 PM EDT
                         I'll be in Albany June 20something - (Steve Lowe) - (1) - April 12, 2003, 07:03:47 PM EDT
                             That'd be cool. - (cwbrenn) - April 12, 2003, 11:08:59 PM EDT
                 This seems like perhaps the best place to put these... - (CRConrad) - (20) - April 12, 2003, 07:03:36 PM EDT
                     various replies - (cwbrenn) - (19) - April 12, 2003, 11:05:38 PM EDT
                         air wrench - (boxley) - (17) - April 12, 2003, 11:52:18 PM EDT
                             Especially since, at 25 below zero... - (CRConrad) - (16) - April 13, 2003, 08:54:54 AM EDT
                                 How exactly do you check them? - (cwbrenn) - (15) - April 13, 2003, 10:35:02 AM EDT
                                     There's a little valve usually near the top - (jake123) - April 13, 2003, 11:25:08 AM EDT
                                     If there IS any air in there in the first place... - (CRConrad) - (13) - April 14, 2003, 05:27:47 AM EDT
                                         Thanks to both! - (cwbrenn) - (12) - April 14, 2003, 03:12:25 PM EDT
                                             pipes wont freeze if they are running - (boxley) - (11) - April 14, 2003, 07:01:58 PM EDT
                                                 Good reminder, Box - (Ashton) - April 14, 2003, 08:47:50 PM EDT
                                                 Also, hot water lines freeze first. - (Another Scott) - (6) - April 14, 2003, 09:18:16 PM EDT
                                                     cheap science experiment - (boxley) - (1) - April 14, 2003, 10:38:32 PM EDT
                                                         It's different in pipes apparently. - (Another Scott) - April 14, 2003, 11:10:40 PM EDT
                                                     Umm a typo, I think - (Ashton) - (3) - April 14, 2003, 11:12:20 PM EDT
                                                         Yabut. - (Another Scott) - (1) - April 14, 2003, 11:41:20 PM EDT
                                                             Heh.. F=\ufffdN - (Ashton) - April 14, 2003, 11:51:09 PM EDT
                                                         as far as antifreeze goes - (boxley) - April 14, 2003, 11:49:28 PM EDT
                                                 But that doesn't help for *these* pipes. - (CRConrad) - (2) - April 15, 2003, 02:36:55 AM EDT
                                                     No tanks in the attic - (cwbrenn) - (1) - April 15, 2003, 09:52:23 AM EDT
                                                         Well.. unless one lives in Iraq___:-) - (Ashton) - April 15, 2003, 05:00:17 PM EDT
                         Kewl, thanks. -NT - (CRConrad) - April 13, 2003, 08:56:09 AM EDT

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