PHYS 1501Q Lecture 40: Thermal Physics
26 Nov 2018
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Physics 1501q - lecture 40 - thermal physics . It is impractical (very difficult) to describe many-particle physical systems via detailed info about individual particles (microscopic motion). Thermal physics is useful in the study of systems consisting of large numbers of particle by describing the system in terms of its macroscopic quantities (like temperature, pressure, entropy, etc. ) Heat (q): the amount of energy transferred from one system to another. Thermal contact: systems are in thermal contact if heat can flow between them. Thermal equilibrium: systems are in thermal equilibrium if they are in thermal contact but have no net heat exchange between them. Similar to mathematical transitive property: if a=b and b=c, then a=c. : the change in a system"s internal energy ( u) is related to the. The system (source: slide 8 of 11/26 lecture slides) 1st law of thermodynamics heat q and the work w as follows:
