Please explain adiabatic,isothermal,and diathermic processes.

Dear student
 
During the operation of a thermodynamic system, there is no energy in the form of heat get in and out of the system from the external environment. There is only internal energy (temperature) variation, and the energy is converted into mechanical energy, which can be expansion (work done by the thermodynamic system) or compression (work done by the external environment). The internal energy and the mechanical energy can be represented by ΔU = W. Although the transmission of heat is isolated in adiabatic process, the energy (temperature) within the system temp is not constant.
Isothermal process
During the operation of a thermodynamic system, the system maintains a constant internal temperature, say, ΔU = ΔT = 0.
But the external heat transmission with the system exists, heat is absorbed or released by converting it into mechanical energy directly, such as isothermal expansion (work done by the thermodynamic system) or isothermal compression (work done by the external environment). The energy transmission can be represented by Q = W.
 
Regards
Arun (askIITians forum expert)

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