Explanation:
Second law tell us that ,the entropy of reversible process is remain constant while the entropy of ir-reversible process increases.
Entropy of universe is the summation of entropy of system and entropy of surrounding.So we can say that
[tex]\Delta S_{universe}=\Delta S_{system}+\Delta S_{surrounding}[/tex]
Entropy can be define as
[tex]ds=\int \dfrac{dQ}{T}[/tex]
Entropy is point function.This is property of system.Ir-reversibility cause the increase of entropy.
[tex]\oint \dfrac{dQ}{T} =0 ,this\ is\ reversible\ process[/tex]
[tex]\oint \dfrac{dQ}{T} >0 ,this\ is\ impossible\ process[/tex]
[tex]\oint \dfrac{dQ}{T} <0 ,this\ is\ irreversible\ process[/tex]
