my teacher said that a broken glass can't fix itself spontaneous because of the second law of thermodynamics, entropy won't decrease in a isolated system. But when the temperature is at 0k, then entropy becomes zero. So if the broken glass can return to its original state, then this doesn't violate any laws, right? Does it means this is possible?
[Physics] Would it be possible that a broken glass can return to its original state spontaneous at 0K
entropythermodynamics
Best Answer
Zero Kelvin is not attainable by a physical system.
Let us not quibble about this, let us suppose a crystal very close to absolute zero in a thermally isolated box with. It has its lowest possible entropy.
To break the lattice energy must be supplied. Suppose an equally cold stone detaches itself from the roof (gravity supplying the energy) and falls on the crystal. The system is now broken crystal, fallen stone and the kinetic energy has increased or statistically the number of microstates is orders of magnitude than it was at t=0, i.e. the entropy has been increased.
There is no way the crystal pieces can be connected again without energy being supplied, which will introduce more microstates. To get back to the original entropy of the crystal energy has to be supplied outside the system, to cool it.
So the broken pieces can be back together again in an open system, where one has to count the total and entropy will be increasing.