Question

Discuss "Heat Death" from the context of the 2^nd Law of Thermodynamics and Entropy.

Answer 1

Second law of thermodynamics states that " it is impossible for a cyclic process to convert heat to work without the simultaneous transfer of heat from a body at high temperature to a body at low temperature " means heat by itself , cannot flow from a cold body to a hot body .

Entropy provides a quantitative measure of disorder. In term of entropy 2^nd law can stated as " The entropy of the universe tends to a maximum."

According to these law heat absorbed by a system cannot be converted fully into useful work without rejecting a part of the heat to a body at lower temperature.

The "heat death" of universe occurs when universe reached maximum state of entropy. when these happen the all energy which is available from hot source is given to cold source i.e there is no available free energy. Thus no work extracted from the universe . Thus universe is dead and these concept is called heat death .