CH111 Lecture Notes - Lecture 15: Chemical Energy, Thermal Conduction, Thermal Conductivity
25 Dec 2018
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16. 1 energy and modes of heat transfer. Kinetic energy in motion (water falling over a dam) Potential energy due to composition or position of object (water stored behind the dam): Gravitational: higher up object is, higher the pe, plays very little role in chem. processes. Electrical: two + charges close together - high pe, ions involved in storing electrical pe. Magnetic: two n poles close together - high pe. Energy stored in a substance because of it"s composition. Heat (q) kinetic energy in the process of flowing from a warmer object to a cooler one. Radiation heat transfer through electromagnetic waves; no contact; Conduction process by which energy transferred as heat through material between two points at different temperatures (without material moving) Atoms nearest higher temperature jostle less energetic neighbors and transfer energy in process. Rate of thermal conduction depends on material thermal conductivity (k) Materials giving off high rates of heat transfer are conductors (such as metals)
