Chapter 15 Notes

Chapter 15 Notes - Thermodynamics is the branch of physics...

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Thermodynamics is the branch of physics built upon the laws obeyed by energy in the form of work and heat . A thermodynamic system is the collection of objects on which attention is being focused, and the surroundings are everything else. The state of a system is the physical condition of the system, as described by values for physical parameters, often pressure , volume, and temperature . Two systems are in thermal equilibrium if there is no net flow of heat between them when they are brought into thermal contact. The zeroth law of thermodynamics states that two systems individually in thermal equilibrium with a third system are in thermal equilibrium with each other. Temperature is the indicator of thermal equilibrium in the sense that there is no net flow of heat between two systems in thermal contact that have the same temperature . The first law of thermodynamics states that due to heat Q and work W , the internal energy of a system changes from its initial value of U i to a final value of U f , according to U = U f - U i = Q - W . The first law is the conservation-of-energy principle applied to heat, work, and change in the internal energy. The internal energy is called a function of state because it depends only on the state of the system and not on the method by which the system came to be in a given state. Heat and work are not functions of state because they depend on how the system is changed from one state to another. Thermal processes are quasi-static when they occur slowly enough that a uniform pressure and temperature exist throughout the system. An isobaric process is one that
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This note was uploaded on 04/09/2008 for the course PHYS 101 taught by Professor Sharp during the Spring '08 term at Ohio State.

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Chapter 15 Notes - Thermodynamics is the branch of physics...

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