Extensive collection of experiments illustrating fundamental principles of physics. Demonstrations on this disc: Kit contains: Laws of Thermodynamics - drill and dowel, mechanical equivalent of heat, CO₂ expansion cooling, adiabatic expansion, fire syringe, Stirling engine, Hero’s engine, cork popper; Phase Changes - liquid nitrogen in balloon, boil water under reduced pressure, CO₂ critical point, drinking bird, freezing by boiling, cryophorus, ice bomb, regelation, Helium and CO₂ balloons in liquid nitrogen, sublimation of CO2, slime ball. DVD with English and Spanish audio tracks and subtitles, and bilingual study guide.