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Unformatted text preview: Thermodynamics Study of relationships among- heat- work- bulk properties of matter and changes from one equilibriumn state to another equilibrium state. Handout 3 - thermodynamic definitions Zeroth law Two bodies in thermal equilibrium with a third body are in thermal equilibrium with each other; this leads to the concept of a temperature scale. Energy E U can be classified as:- heat q (positive when absorbed by the system)- work w (positive when done on the system) q and w are not state functions they depend on path and are forms of energy in transit. 1 heat and heat capacity If add q to system, T rises dq = CdT (1) or the heat capacity C C = dq dT (2) C depends on conditions, and we use C V (or C P ) for constant volume (or pressure) processes. work is always equivalent to lifting a weight. For mechanical work ( eg. lifting a weight) dw = P ext dV (3) IMPORTANT NOTE : P ext is the actual weight lifted....
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- Spring '07