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Thermodynamics Question 2

When a gas expands adiabatically; it does work on its surroundings. But if there is no heat input to the gas, where does the energy come from to do the work?

Note by Mark Kevin Aguilar
3 years, 10 months ago

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It's the internal energy of the gas that it uses to do work in an adiabatic process. Saurabh Dubey · 3 years, 10 months ago

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@Saurabh Dubey yeah that's right.......and that's why the temperature of the gas drops after adiabatic expansion as temperature is directly proportional to internal energy of the gas......... Rajath Krishna R · 3 years, 10 months ago

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@Rajath Krishna R u r correct but at inversion temp the opp happens Himank Bhalla · 3 years, 10 months ago

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@Rajath Krishna R You are back!!. Was the pendulum (changing value of g) question correct? Saurabh Dubey · 3 years, 10 months ago

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@Saurabh Dubey yeah that's it............. Rajath Krishna R · 3 years, 10 months ago

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It is due to intramolecular force existing between molecules by 'String Theory' or 'Harmonic Oscillator'!! Subhrodipto Basu Choudhury · 3 years, 10 months ago

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from internal energy as dQ=dU+dW and dQ is 0 Tarun Bansal · 3 years, 10 months ago

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If gas expands adiabatically and if it is a free expansion no work is done by the gas....free expansion means into vaccum..since question is not that clear, will answer another question also...if it expands against a piston, definitely it has to do some work and it reduces its temperature hence uses itS internal energy... Ajith Mohan · 3 weeks, 1 day ago

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Internal pressure of gas is more than external pressure , so gas expands without any heat input. Aditya Pratap Rana · 1 year, 5 months ago

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internal energy Dastgir Baadshah Khan Pathan · 3 years, 10 months ago

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