Clausius Inequality. Heat transfer. Second law of thermodynamics. Entropy.

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Sum of all Q/T terms is zero or smaller than zero in thermodynamic cycle.
Adiabatic wall, Diathermal wall,Thermodynamics,Thermometers,Thermal Equilibrium, Equilibrium,non equilibrium, Thermometers, Second law of thermodynamics,First law of thermodynamics, Zeroth law of thermodynamics,Third law of thermodynamics, Heat transfer, Cooling mechanism,Refrigerators,Heat pump,coefficient of performance,Thermodynamic efficiency,Heat engines,System,surrounding, isothermal, Adiabatic, Diathermal, open system, closed system, isolated system.Entropy.