Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site dartvax.UUCP Path: utzoo!linus!decvax!dartvax!dnc From: dnc@dartvax.UUCP (David Crespo) Newsgroups: net.physics Subject: Re: heating and cooling Message-ID: <663@dartvax.UUCP> Date: Tue, 31-Jan-84 20:04:33 EST Article-I.D.: dartvax.663 Posted: Tue Jan 31 20:04:33 1984 Date-Received: Thu, 2-Feb-84 01:32:08 EST References: <143@cbnap.UUCP> Organization: Dartmouth College Lines: 26 in a perfect insulator, such as a thermos, no matter what temp you keep it at, it won't lose any heat, so then it would seem that one would just as soon cork it up and wait, since lowering it to final temp before or after will not affect its temp wwhen final. however, no insulator is perfect, except thermos brand thermoses, which they don't have inthis part of arkansas, so: case 1 is i have milk and i have coffee, both in insulators (aha, this means above, that the milk must also be in a thermos, else it will cool while we wait, in which case we either get a lower final temp when we pour it in as we return, but longer (useless) maxheat (strictly speaking), or a higher finaltemp since we pour it in earlier, assuming milk at greater than room temp, or if milktemp init is lower htan room, it will warm, and when poured in later it will reach a higher final temp than if it were poured in before leaving, though the coffee hen is at a lower temp during departure, so we need some measure of degree-minutes, which we are trying to maximize, or a highest final appreciation temp, which is what I assume we want, unless we want to be really clever and don't care, since we are realy going for perfect temp, not maxtemp. see? this all assumes of course that we have a perfect insulator, (it doesn't matter whether we pour the milk in the coffee or vice versa, or both in a third container (unless that would take too long))so that gat least on temp remains constant. what if we let the coffee (since we have only a small insulator), then final temp falls,