tag:blogger.com,1999:blog-18654361.post343532012778768771..comments2023-07-06T15:14:57.204+01:00Comments on JOHN'S BLOG: SupercoolingJohnhttp://www.blogger.com/profile/02487495921222083129noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-18654361.post-44694455485092879842007-01-31T07:18:00.000+00:002007-01-31T07:18:00.000+00:00The issue in the pan is partly the dents / localis...The issue in the pan is partly the dents / localised hot spots on the bottom (I'd guess due to imperfections in the pan) which as you point out serve as nuclei for the boiling.<br /><br />Are they put there deliberately on modern pans? Don't know.Johnhttps://www.blogger.com/profile/02487495921222083129noreply@blogger.comtag:blogger.com,1999:blog-18654361.post-31034449717252961192007-01-30T23:35:00.000+00:002007-01-30T23:35:00.000+00:00So water won't boil in a microwave (I've seen this...So water won't boil in a microwave (I've seen this), but will boil in a hot pan because the hotter pan around the cooler water generates currents which brings on the rolling boil? <br />...and there seem to be <i>somethings</i> on or in the base of nearly all the pans I've looked at, from where the bubbles of boilling seem to originate.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-18654361.post-27920446141902214432007-01-30T21:22:00.000+00:002007-01-30T21:22:00.000+00:00It'd need to have had a fair bit of air in the bot...It'd need to have had a fair bit of air in the bottle to start with, otherwise the expansion would, as you point out, have burst it.<br /><br />Free from condensation - I assume that it hadn't been above 0 for a while. You need water vapour in the air for condensation.<br /><br />I don't think the engine was running.<br /><br />Yes, it's possible it's some kind of fast phase transition in gel or Johnhttps://www.blogger.com/profile/02487495921222083129noreply@blogger.comtag:blogger.com,1999:blog-18654361.post-22681388315887194452007-01-30T20:14:00.000+00:002007-01-30T20:14:00.000+00:00So how does one supercool something?
In the past...So how does one supercool something? <br /><br />In the past i have put unopened, chilled bottles of water into the freezer compartment of fridges and then had the tops pop off.<br /><br />The bottles in the video were free from condensation, how come? <br />They did appear to be placed over the vents which may have been the a/c vents, so the air could have been really chilly and the passing Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-18654361.post-21784219234298459522007-01-29T23:19:00.000+00:002007-01-29T23:19:00.000+00:00As I recall, a fair bit of expansion takes place o...As I recall, a fair bit of expansion takes place on the cooling rather than the freezing, so it's already expanded.<br /><br />Fast transitions like that also generally don't involve expansion or contraction - the molecules don't have time to rearrange fully... I think.Johnhttps://www.blogger.com/profile/02487495921222083129noreply@blogger.comtag:blogger.com,1999:blog-18654361.post-42072401275368787852007-01-29T22:05:00.000+00:002007-01-29T22:05:00.000+00:00As it becomes ice, why doesn't it expand and defor...As it becomes ice, why doesn't it expand and deform the bottle?Anonymousnoreply@blogger.com