Limitation of First Law

Limitation of First Law

  • Limitation of First Law
  • The First law allows us to calculate the energy changes, but it does not places no restriction on the direction of a process
  • Satisfying the first law does not ensure that the process can actually occur.
  • The reverse processes discussed in the previous slide violate the second law of thermodynamics. This violation is easily detected with the help of a property, called entropy
  • A process cannot occur unless it satisfies both the first and the second laws of thermodynamics