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
What is a thermodynamic process?
Draw a p-V diagram showing negative work with varying pressure.
State the assumptions made for thermodynamic processes.
Differentiate between the reversible and irreversible processes.
Explain the cyclic process.
3 mole of a gas at temperature 400 K expands isothermally from an initial volume of 4 litres to a final volume of 8 litres. Find the work done by the gas. (R = 8.31 J mol-1 K-1)
Explain the thermodynamics of the isobaric process.
Explain thermodynamics of the adiabatic process.
When you exercise in the morning, by considering your body as a thermodynamic system, which of the following is true?
The V-T diagram of an ideal gas which goes through a reversible cycle A→B→C→D is shown below. (Processes D→A and B→C are adiabatic)
The corresponding PV diagram for the process is (all figures are schematic)
In an isochoric process, we have ____________.
Give the equation of state for an adiabatic process.
What are the limitations of the first law of thermodynamics?
Draw the TP diagram (P-x axis, T-y axis), VT(T-x axis, V-y axis) diagram for
- Isochoric process
- Isothermal process
- Isobaric 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)
Consider the following cyclic process consist of isotherm, isochoric and isobar which is given in the figure.
Draw the same cyclic process qualitatively in the V-T diagram where T is taken along the x-direction and V is taken along the y-direction. Analyze the nature of heat exchange in each process.
An ideal gas is taken in a cyclic process as shown in the figure. Calculate
- work done by the gas
- work done on the gas
- Net work done in the process
One mole of an ideal gas with `gamma` = 1.4 is adiabatically compressed so that its temperature rises from 27° C to 47° C. The change in the internal energy of the gas is (R = 8.3 J/mol.K) ____________.
In which of the following processes, beat is neither absorbed nor released by a system?
In an isothermal process, the volume of an ideal gas is halved. One can say that ____________.
Assertion: Equal volumes of monatomic and polyatomic gases are adiabatically compressed separately to equal compression ratio `("P"_2/"P"_1)`. Then monatomic gas will have greater final volume.
Reason: Among ideal gases, molecules of a monatomic gas have the smallest number of degrees of freedom.
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?
An ideal gas is taken through a cyclic process ABCDA as shown in figure. The net work done by the gas during the cycle is ______.
