Entropy increase and end of the universe While taking thermodynamics our chemistry teacher told us that entropy is increasing in day by day (as per second law of thermodynamics), and when it reaches its maximum the end of the world will occur. I didn't see such an argument in any of the science books, is there any probablity for this to be true?
 A: What your describing is the theory of the Heat death of the universe which is speculated about since 1850s. However, as explained here, object at astronomical scale are often self-gravitating and that gives them have unintuitive thermodynamical properties like a negative heat capacity. This usually gives more structured systems as entropy increases, and negates the idea of heat-death.
Furthermore, given the fact that the universe is currently thought to be forever expanding and that the majority of the entropy is/will be in black-holes, the estimated time-scale for such thermal equilibrium to occur is huge (of the order of 10100 years), which gives us vastly enough time to change our cosmological theories about the end of the universe...
A: heat death( in which I don't believe) is the condition when all available energy fails to exist due to an enormous increment in universes entropy. entropy is a thermodynamic quantity which is arrow of time(means it can tell us if time is going forward or backward). no process can not decrease the overall entropy of the universe.by the time the entropy reaches its maximum value the universe will have failed to exist as there is no available energy to do work.
