The Physics 2 Tutor: Learning by Example DVD series covers thermodynamics, oscillations & waves in physics through step-by-step example problems. Emphasis is placed on giving students confidence in their skills by gradual repetition so that the skills learned are committed to long term memory. Lessons cover the expansion and contraction of solids and liquids, including the nature of expansion and contraction and how this process occurs as a result of temperature change. Grades 9-12. 48 minutes on DVD.