16-25. At absolute zero temperature, the atoms in a material are stationary and in fixed positions. When the material is heated from this temperature, the atoms move 16 As a consequence the material 17. If only one end of a rnd of material is heated, some of the heat energy travels to the other end. The way the energy travels cepends on the material, ir particular on 18.._. In metals the energy is carried by in ceramics by 2020; and in polymers by 2121. The best insulating materials are the 22, but they are not useful at high temperatures such as you would find in your furnace because they 23. We can greatly improve the insulating properties by which use this principle. The material they are made from is 25 16. (a) further apart (b) more rapidly (c) to form vacancies (d) from a fixed position (e) all of these 17. (a) becomes amorphous (b) expands (c) bends (d) shrinks (c) decomposes 18. (a) its crystal structure (b) the types of atoms (c) the bonding (d) its microstruchire (e) its dimensions 19. (a) phonons (b) photons (c) free electrons (d) atom collisions (c) protons 20. (a) phonons (b) photons (c) electrons (d) atom collisions (e) electron boies. 21. (a) phonons (b) electron holes (c) electrons (d) atom collisions (e) protons 22. (a) ceramics (b) semiconductors (c) polymers (d) glasses (e) metals 23. (a) become brittle (b) decompose (c) are flammable (d) become conductive (e) all four are true 24. (a) precipitates (b) air pockets (c) point defects (d) larger atoms (c) fibers 25. (a) silicon (b) silica (c) titanium (d) a silicate (e) silicone