Advertisements
Advertisements
प्रश्न
Write a note on free expansion.
Advertisements
उत्तर
- Free expansions are adiabatic expansions thus there is no exchange of heat between a system and its environment.
- Also, there is no work done on the system or by the system. Q = W = 0, and according to the first law of thermodynamics, ΔU = 0.
- For example, when a balloon is ruptured suddenly, or a tire is suddenly punctured, the air inside rushes out rapidly but there is no displacement of a piston or any other surface.
- A free expansion is different than other thermodynamic processes because it is an uncontrolled change. It is an instantaneous change and the system is not in thermodynamic equilibrium.
- A free expansion cannot be plotted on a p-V diagram. Only it's initial and the final state can be plotted.
APPEARS IN
संबंधित प्रश्न
Heating a gas in a constant volume container is an example of which process?
Draw a p-V diagram showing positive work with varying pressure.
Draw a p-V diagram showing negative work with varying pressure.
Differentiate between the reversible and irreversible processes.
Explain the thermodynamics of the isobaric process.
When food is cooked in a vessel by keeping the lid closed, after some time the steam pushes the lid outward. By considering the steam as a thermodynamic system, then in the cooking process
In an isochoric process, we have ____________.
Give the equation of state for an isothermal process.
Give the equation of state for an adiabatic process.
Draw the PV diagram for the adiabatic process.
Draw the PV diagram for the isobaric process.
Derive the work done in an isothermal process.
Derive the work done in an adiabatic process.
Explain the isobaric process and derive the work done in this process.
In an adiabatic expansion of the air, the volume is increased by 4%, what is the percentage change in pressure? (For air γ = 1.4)
An ideal gas is expanded isothermally from volume V1 to volume V2 and then compressed adiabatically to original volume V1. If the initial pressure is P1, the final pressure is P3 and net work done is W, then ____________.
An ideal gas A and a real gas B have their volumes increased from V to 2V under isothermal conditions. The increase in internal energy ____________.
For an isothermal expansion of a perfect gas, the value of `(Delta "P")/"P"` is equal to ____________.
In an isothermal process, the volume of an ideal gas is halved. One can say that ____________.
An ideal gas is compressed to half its initial volume by means of several processes. Which of the process results in the maximum work done on the gas?
We consider a thermodynamic system. If `Delta"U"` represents the increase in its internal energy and W the work done by the system, which of the following statements is true?
The work done on the system in changing the state of a gas adiabatically from equilibrium state A to equilibrium state B is 22.4 J. If the gas is taken from state A to B through another process in which the net heat absorbed by the system is 15.5 cal, then the net work done by the system in the latter case is ______.
( l cal = 4.2 J)
Which of the following processes is reversible?
In the figure shown here, the work done in the process ACBA is ______.
In a certain thermodynamical process, the pressure of a gas depends on its volume as kV3. The work done when the temperature changes from 100°C to 300°C will be ______ nR, where n denotes number of moles of a gas.
When an inflated ballon is suddenly burst, why is the emerging air slightly cooled?
In a cyclic process, if ΔU = internal energy, W = work done, Q = Heat supplied then ______.
