Give an equation for the infinitesimal change in entropy, ds, of a system in terms of the heat transfer SQR and the temperature T at which the heat transfer occurs. Explain the sign convention. A litre of water at 20 °C is placed in a fridge at 5 °C. Calculate the change in entropy of the water, including the sign, once all the water has come into thermal equilibrium. Calculate the change in entropy of the fridge from part ii, including the sign. Demonstrate that the Second Law has been obeyed in the process described in ii and iii.
Give an equation for the infinitesimal change in entropy, ds, of a system in terms of the heat transfer SQR and the temperature T at which the heat transfer occurs. Explain the sign convention. A litre of water at 20 °C is placed in a fridge at 5 °C. Calculate the change in entropy of the water, including the sign, once all the water has come into thermal equilibrium. Calculate the change in entropy of the fridge from part ii, including the sign. Demonstrate that the Second Law has been obeyed in the process described in ii and iii.
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Transcribed Image Text:i.
ii.
iv.
Give an equation for the infinitesimal change in entropy, dS, of a system in terms of the heat
transfer SQR and the temperature T at which the heat transfer occurs. Explain the sign convention.
A litre of water at 20 °C is placed in a fridge at 5 °C. Calculate the change in entropy of the water,
including the sign, once all the water has come into thermal equilibrium.
Calculate the change in entropy of the fridge from part ii, including the sign.
Demonstrate that the Second Law has been obeyed in the process described in ii and iii.
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