For an Isochoric process equation connecting P, V and T gives. All the heat given to the system has been used to increase the internal energy of the system. When volume does not change no work is done, $\Delta W = 0$ and therefore from first law of Thermodynamics. In an Isochoric process volume of the system remain uncharged throughout i.e. Here is the P-V graph of an ideal gas for two adiabatic processes connected two isotherms We can see the PV diagram of Isothermal Process and Adiabatic Process is similar. PV diagram for the adiabatic Process is shown as below. if an ideal gas undergoes a change in its state adiabatically from $(P_1, V_1)$ to $(P_2,V_2)$, we have. For adiabatic process of ideal Gas, the relation between Pressure and Volume is given by. Here internal energy of systems decreases resulting a drop in temperature. If work is done by the system i.e., $\Delta W$ is negative. $\Delta W$ is negative then.Īnd internal energy of system increases by an amount equal to the work done on it and temperature of system increases. If work is done on the system contracts i.e. In adiabatic process change in internal energy of a system is equal in magnitude to the work by the system. On applying first law to adiabatic process we get. Flow of heat requires finite time so if a process is perfomed very quickly then process will be practically adiabatic. Prevention of heat flow can be accomplished by surrounding system with a thick layer of heat insulating material like cork, asbestos etc. For every adiabatic process $\Delta Q=0$. Process in which no heat enters or leaves a system is called an adiabatic process. #Isothermal process workdone tv
TV diagram for the Isothermal process is shown below.
PV diagram for the Isothermal process is shown below. Heat added (or subtracted) from the system = work done by (or on) the system Therefore From First law of Thermodynamics In isothermal process there is no change in temperature, since internal energy for an ideal gas depends only on temperature hence in isothermal process there is no change in internal energy. I.e., pressure of given mass of gas varies inversely with its volume this is nothing but the Boyle's law. For an isothermal process equation connecting P, V and T gives. In isothermal process temperature of the system remains constant throughout the process. The processes define below quasi-static processes only, except when stated otherwise. are reasonably approximation to an ideal quasi-static process. In practice, processes that are sufficiently slow and do not involve accelerated motion of the piston, large temperature gradient, etc. Quasi static process is an idealized concept and its conditions can never be rigorously satisfied in practice. During quasi-static process system at every moment is infinitesimally near the state of thermodynamic equilibrium. Vanishingly slowness of the process is an essential feature of quasi-static process. Consider a system in which gas is contained in a cylinder fitted with a movable piston then if the piston is pushed in a infinitely slow rate, the system will be in quiescent all the time and the process can be considered as quasi-static process. All the states through which system passed during a quasi static process may be regarded as equilibrium states. 
In Quasi static process deviation of system from it's thermodynamic equilibrium is infinitesimally small.
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