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Audio Video Interleaved Video  |  2012-12-18  |  8.6 MB  |  476x256  |  10fps  |  1 minute, 48 seconds
Transcription: In order to give you an idea of what happens when a substance is heated, I want you to imagine taking an ice cube out of the freezer and putting it on the counter. Now we all know what's going to happen to this ice cube. It's going to melt. But let's think about what happens to the individual water molecules which make up this ice cube. Well in order to melt, the first thing that has to happen is this ice cube must warm up. After all, the freezer it was sitting in is at a temperature well below the freezing point of water. So in order to be able to melt, the ice cube has to first warm up. What ...