First law of thermodynamics and its applications (only for ideal gases) 26.1;
26.1 ΔU = ΔQ - ΔW or
ΔQ = ΔU + ΔW
26.2 ΔW =∫pΔV from V1 to V2
26.3 Work done in an Isothermal process:
W is given by the expression nRTln[V2/V1]
Work doen in an Isobaric process - pressure is constant
W = p[V2 - V1]
Work done in an isochoric process: volume is constant. No work is done by the system.
4. Efficiency of an engine
η = W/Q1 = 1 - Q2/Q1
Q1 = Amout of heat taken by the engine
Q2 = Heat rejected by the engine to low temperature bodies
5. Entropy
∆S = ∆Q/T
6. Sf - Si = ∫∆Q/T from i to f
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