Calling another principle-2nd law Only the first law is inadequate to identify whether a process can take place. Another guiding principle would be helpful.This is provided by the 2nd law The above inverse processes violate the 2nd law, so not spontaneous. A process cannot occur unless it satisfies both the first and the second laws of thermodynamics 上游充通大学 Mar/29,Wed,2017 8 SHANGHAI JLAO TONG UNIVERSITYMar/29, Wed, 2017 8 Calling another principle- 2 nd law Only the first law is inadequate to identify whether a process can take place. Another guiding principle would be helpful. This is provided by the 2nd law The above inverse processes violate the 2nd law, so not spontaneous. A process cannot occur unless it satisfies both the first and the second laws of thermodynamics