Heat is a mode of energy transfer Heat is not a property

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Presentation transcript:

Heat is a mode of energy transfer Heat is not a property HEAT, Q [J, kJ] Heat - Energy that is being transferred due to a temperature difference Heat is a mode of energy transfer Heat is not a property Energy is related to states (property) Heat is related to processes (not a property, depends on the path) = rate of heat transfer Amount of heat transferred during a process (depends on the path)

Adiabatic Process (Q = 0) insulated Tsystem= Tsurrounding Heat (ctd.) system Qin= +ve Qout= -ve Adiabatic Process (Q = 0) insulated Tsystem= Tsurrounding Adiabatic  Isothermal! (T can change by other methods; energy can enter system by work) ≠