IV.3. Because all of the energy is used to change the form of matter, so there is not enough thermal energy to melt the substance.
IV.4 As thermal energy increases, the particles vibrate, and the crystalized structure is broken, causing it to turn into a liquid.
IV.5 A potato has a lot of water. When water is heated, it expands. So the expansion causes the pressure to build up. If you don't poke holes in it, it will EXPLODE!!!!!
V.1Heat is transferred from the source, through the "working body" of the engine, to the sink, and in this process some of the heat is converted into work by exploiting the properties of a working substance (usually a gas or liquid). --> http://en.wikipedia.org/wiki/Heat_engine
V.2 They heat up differently. One uses insulators whilst the other uses convection. Although they both use heat to work.
V.3 External Combustion Engines heat up more.
V.4 Gas to a liquid.... Condensation
V.5 The cold would not escape, the heat would move in pushing the air out and making it hotter.
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