State second law of thermodynamics.

Explanation

Since all the natural processes are spontaneous, they take place with increases in the entropy.
Hence second law of thermodynamics can be represented mathematically as
`DeltaS_("Total") = DeltaS_("system") + DeltaS_("surr") gt 0 ` (for spontaneous process)
`DeltaS_("Universe") = DeltaS_("System") + DeltaS_("surr") gt 0`