Gas Expansion and Work: Effects on Internal Energy and Temperature

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SUMMARY

The discussion centers on the effects of lifting a gas-filled cylinder on work, internal energy, and temperature. Two scenarios are analyzed: lifting the cylinder slowly and lifting it suddenly. In both cases, the work done on the gas is equal to the gravitational potential energy gained, but the internal energy and temperature of the gas remain unchanged due to the nature of the gas's kinetic energy. This highlights the distinction between work done on the gas and changes in its internal state.

PREREQUISITES
  • Understanding of thermodynamics principles, specifically work and energy transfer.
  • Familiarity with the concepts of internal energy and temperature in gases.
  • Knowledge of gravitational potential energy calculations.
  • Basic grasp of kinetic energy and its relation to temperature in gas molecules.
NEXT STEPS
  • Study the First Law of Thermodynamics and its application to gas systems.
  • Learn about the relationship between work, internal energy, and temperature changes in gases.
  • Explore the concept of adiabatic versus isothermal processes in gas behavior.
  • Investigate potential energy changes in various thermodynamic systems.
USEFUL FOR

This discussion is beneficial for students of thermodynamics, physics enthusiasts, and anyone seeking to understand the principles of work and energy in gas systems.

gandharva_23
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A cylinder containing a gas is lifted from the first floor to the second floor .What is the amount of work done on the gas ? What is the amount of work done by the gas ? Is the internal energy of the gas increased ? Is the temperature of the gas increased ?
consider 2 cases :
case 1 : the cylinder is taken up slowly
case 2 : cylinder is suddenly taken up and stopped
 
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One needs to show some effort to answer these questions, please. :smile:

What does it mean to do work on the gas, or for the gas to do work?

Does the 'boundary' of the gas change, i.e. does the volume of gas change?
 
Sir i have just started studying heat . did not find it interesting at all . please suggest some good book . What i thought in this question was that the potential energy of the gas molecules will increse so the randomness of gas molecules will change hence the temperature of the gas will increase . But the answer given in the book that i referred was that nothing will change . then i thought it is probably because the tempetature of the gas is only due to the KE of the gas which probably will not change (wont it change ?) and i got totally confused . it is probably the ugliest topic . so many assumptions ...
 

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