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lectureHeatCapacity

# lectureHeatCapacity - Heat Capacity Internal Energy and...

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Heat Capacity, Internal Energy, and Heat Energy. DEFINITION: Heat Capacity – Amount of heat energy required to raise the temperature of a substance per unit degree. T Q C = Specific Heat Capacity – Heat Capacity per unit mass m C c = In differential form the specific heat is defined as: dT Q m c δ 1 = Note that for gases the amount of heat energy required to raise the temperature by a degree will depend on the particular process. We therefore must specify the process. Consider the constant volume and constant pressure processes. Specific heat at constant volume : dT Q m c v v δ 1 = Specific heat at constant pressure : dT Q m c p p δ 1 = From the differential form of First Law of thermodynamics, 1 Heat Energy Temperature Difference Heat Capacity Rigid container (constant volume) Gas Gas Weight, Assures constant pressure in cylinder Frictionless Piston Rigid walls

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dU = δ Q - δ W we obtain an expression for heat energy, δ Q = dU + δ W.
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