Biology 1002B Lecture Notes - Lecture 4: Isolated System, Thermodynamics, Closed System
16 Oct 2013
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Energy cannot be measure or weighed directly. Can only detect it by its ability to do work. They can all be converted or transformed readily form one form to another. Kinetic energy: energy possessed by an object because its in motion. Potential energy: stored energy, the energy an object has because of its location or chemical structure. The laws of thermodynamics describe energy and its transformation: Open system: both energy and matter can move freely between system and. Isolated system: does not exchange matter or energy with surroundings surroundings. Closed system: can exchange energy but no matter. The first law of thermodynamics: energy can be transformed but not created or destroyed. The second law of thermodynamics: energy transformations increase disorder. Each time energy is transformed from one form to another, some of the energy is lost and unavailable to do work. A lot of energy is lost as heat (energy associated with random molecular motion).
