CHEN 3101 Lecture Notes - Lecture 1: Balun, Mechanics
25 Dec 2014
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Document Summary
Clausius 1863: die energy der welt bleibt ronstant. All eqns come from these laws; derived from the laws. Systems and balance equations system boundary surroundings/environment system lot of pchem deals with closed systems lot of mass/energy balance deals with open systems: material crosses boundaries. Balance equation (rate form: how things change in time) {rate of accumulation of something (mass, energy)} = {flux across system boundary} + {rate of creation/destruction w/in system boundary} Entropy is created at a measurable rate for this course. Energy can enter/leave a closed system by 2 mechanisms: heat flow across the system boundary; direct transfer of molecular energy, macroscopic work across system boundary. Notation: e = total energy (internal energy + mechanical (newtonian mechanics) energy + potential. Notation: e = total energy (internal energy + mechanical (newtonian mechanics) energy + potential energy) Example: imagine you have a baseball with system boundary that encloses baseball. Rather than looking @ rate, can look at process over time.
