SCI201 Lecture Notes - Lecture 4: Thermodynamic System
24 Jan 2018
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Document Summary
Initially two objects do not have same temperature put them in thermal contact for long time the two temperatures become the same (thermal equilibrium) Contact does not always mean physical contacts. Energy always flow from warmer to colder objects. Heat: amount of energy that is transferring (energy transfer) (when delta t is not 0) Change in u (internal energy) is q (heat) transferred. 1st law: delta u = q (not a general form) Energy of the thermodynamic system can be changed by heating or cooling (one of the ways to change internal energy of object is to heat or to cool it) 1st law: delta u = q + w (general form) The internal energy of a substance is the kinetic and potential energy of the molecules of a substance. Energy of systems can be changed in two ways: heating/cooling (q, work (w) (i. e. the simplest form is mechanical work)
