Question

Give your own example of each of the following: (a) A process the follows the first and second law of thermodynamics. (b) A process that follows the first but not the second law of thermodynamics. (c) A process that follows neither the first nor the second law of thermodynamics.

Answer 1

(a) A closed system (can exchange enrgy but not matter with surrounding) which executes complete cycle follow first law of thermodynamics i.e. sum of heat interaction is equal to sum of work interaction. Here internal energy is zero.

(b) Hot cup of milk on table becomes cool after sometimes. This is an example of second law of thermodynamics which states heat flow from hight temperature to low temperature region without ass of external agent.

(c) Process inolving decrease in entropy doesn't follow first and second law of thermodynamics.

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