1 00:00:10,360 --> 00:00:12,250 This is day seven of Fire and Ice. 2 00:00:14,1000 --> 00:00:17,530 I'm less prepared for today than I've been for 3 00:00:17,530 --> 00:00:22,570 any of the other days. I spent a lot of time putting together 4 00:00:22,570 --> 00:00:27,290 some experimental hands on things for the students to do today and normally I have 5 00:00:27,290 --> 00:00:31,130 an agenda worked out that I've thought through all the implications of 6 00:00:32,190 --> 00:00:37,330 But that didn't happen today and that's not unusual, that will happen on occasion 7 00:00:37,330 --> 00:00:42,190 So today it's going to be all experimental work, what I'm trying to do is 8 00:00:43,780 --> 00:00:48,510 Have students explore some phase change phenomenon, melting and 9 00:00:50,760 --> 00:00:56,250 Boiling of materials and looking essentially at heating and cooling curves. 10 00:00:56,250 --> 00:01:02,210 I found a set of materials that I tried out with the set of equipment we have so 11 00:01:02,210 --> 00:01:07,600 that hopefully we get reliable data fairly quickly and both heating and 12 00:01:07,600 --> 00:01:13,270 cooling curves for the same substance and with an array of behaviors. 13 00:01:14,960 --> 00:01:19,870 And this is to lay the groundwork for talking about phase change, 14 00:01:19,870 --> 00:01:24,920 the heat involved in phase change and what's called latent heat. 15 00:01:26,950 --> 00:01:30,350 I've noticed in students writings about 16 00:01:31,420 --> 00:01:36,380 The nature of heat and temperature in this past week is they're still trying to put 17 00:01:36,380 --> 00:01:39,750 these ideas together and they're still very fuzzy on what 18 00:01:41,430 --> 00:01:47,230 The ideas are, particularly when they refer to the particulate nature of matter so 19 00:01:47,230 --> 00:01:48,910 this week is going to help push that. 20 00:01:50,420 --> 00:01:53,430 Leading into this class I had them use the FET 21 00:01:54,630 --> 00:01:59,450 Simulation on states of matter, which essentially just 22 00:01:59,450 --> 00:02:04,220 looks at heating and cooling a substance and taking it through solid, liquid 23 00:02:04,220 --> 00:02:09,180 gas phase changes, not looking at phase diagrams at this point but 24 00:02:09,180 --> 00:02:13,930 just the idea of the relationship of temperature and heat input or 25 00:02:13,930 --> 00:02:21,200 output to the thing that causes changes in the amounts of motion of the particles and 26 00:02:21,200 --> 00:02:27,510 that leads to eventually changes in phase. So we're working into these relationships 27 00:02:27,510 --> 00:02:31,840 by exploring at the particulate level exploring it experimentally. 28 00:02:33,200 --> 00:02:37,210 And then not today, we might get the data graphed. 29 00:02:38,470 --> 00:02:43,420 They're taking it manually and graphing it manually each group of three students 30 00:02:43,420 --> 00:02:48,270 is doing a different experiment under the same fundamental ideas or 31 00:02:48,270 --> 00:02:50,970 the same fundamental procedure and 32 00:02:52,050 --> 00:02:55,420 If we can at least get the data graphed today then we'll be able to talk about 33 00:02:55,420 --> 00:02:56,860 that the next time we get together. 34 00:02:58,160 --> 00:03:02,700 So hopefully the experimental world works for us today. 35 00:03:04,700 --> 00:03:07,410 And it will enable us to 36 00:03:07,410 --> 00:03:12,230 take the next step in thinking about the relationship of heat and substances.