Supply the heat in a quasi static manner so that at every moment system is in equilibrium. Heating in this manner will take indefinite amount of time but the process would be reversible.
There is no connection of a process being isobaric and being reversible. There is no connection of a process being isobaric and being reversible. Both are two different concepts but usually people gets confused in this just because the formula of work done is same for both cases.
which one is a reversible process? A reversible process is one which can be taken from its initial state to another state, and then back to the initial state without any change to either the system or the surroundings.
Correspondingly, are reversible processes possible?
A reversible process is one that is infinitely slow! Obviously, no real process is reversible but you can approximate a reversible process by doing it as slowly as possible. For example, you can think of a reaction that is at equilibrium as occurring infinitely slowly (nothing is happening!).
How do you tell if a process is reversible or irreversible?
Process: when the state variables change in time. Reversible Process: when every step for the system and its surroundings can be reversed. A reversible process involves a series of equilibrium states. Irreversible Process – when the direction of the arrow of time is important.
What is constant in an isobaric process?
An isobaric expansion of a gas requires heat transfer to keep the pressure constant. An isochoric process is one in which the volume is held constant, meaning that the work done by the system will be zero. The only change will be that a gas gains internal energy.
What is CP and CV?
Cp is an amount of heat required to raise temperatire of an unit mass (1kg) by 1 degree Celsius when the system is at constant pressure. And Cv is an amount of heat required to raise the temperature of a unit mass by 1 degree Celsius when the volume of the system is constant.
What does Polytropic mean?
The term “polytropic” was originally coined to describe any reversible process on any open or closed system of gas or vapor which involves both heat and work transfer, such that a specified combination of properties were maintained constant throughout the process.
What happens to temperature in an isobaric process?
In the isobaric expansion, the gas does work by absorbing heat and its temperature increases. In the isobaric compression, the gas undergoes work losing heat and its temperature decreases.
Is work done at constant pressure?
and the area multiplied by the distance is a volume, specifically the change in volume of the gas. So, at constant pressure, work is just the pressure multiplied by the change in volume: This is positive because the force and the distance moved are in the same direction, so this is work done by the gas.
What does Isochoric mean?
An isochoric process, also called a constant-volume process, an isovolumetric process, or an isometric process, is a thermodynamic process during which the volume of the closed system undergoing such a process remains constant.
Why is no work done in an isochoric process?
So the work done by the gas on the surroundings decreases the internal energy and temperature of the gas. In the isochoric process, there is no work done. So the heat added to the gas increases the internal energy and temperature of the gas.
Are isothermal processes reversible?
Just being isothermal does not necessarily make a process reversible. There are plenty of isothermal processes that are not reversible. The other two legs (4 to 1 and 2 to 3) are adiabatic compression or expansion and the temperature changes but they are reversible processes.
Why are reversible processes important?
Reversible processes are important because they are related to the efficiency of a process. Then we would say the process is reversible, because in the same ideal world you could input W0 into the system and once again create the same original temperature gradient in the hotplates.
What is irreversible process example?
Some examples of irreversible processes are electric current flow through a conductor with a resistance, magnetization or polarization with hysteresis, inelastic deformation, fluid flow with shock wave, and mixing of fluid with different temperatures, pressures, and/or compositions.
Is Carnot cycle reversible?
The Carnot cycle is reversible representing the upper limit on the efficiency of an engine cycle. Practical engine cycles are irreversible and thus have inherently lower efficiency than the Carnot efficiency when operating at the same temperatures.
What makes a system reversible?
A thermodynamic process is reversible if the process can return back in such a that both the system and the surroundings return to their original states, with no other change anywhere else in the universe. It means both system and surroundings are returned to their initial states at the end of the reverse process.
Why is Carnot engine reversible?
The Carnot cycle heat engine was specifically designed to be reversible by virtue of the two isothermal and adiabatic steps. If these expansion and compression steps are nor reversible, then some of the energy will be dissipated (eg. to overcome friction). Hence the engine will produce less work.