Proposed 2nd Law of Thermodynamics: An assertive statement

Three rudimentary examples of the application of this '2nd Law principle' for modeling processes are presented in this paper; one for a transient 'heat transfer' process, one for a 'mechanical' process, and a third for a combined thermal and pneumatic process. It is shown how available energy provides a key to modeling processes of different 'types' - heat transfer, mechanics, pneumatics. Heretofore each type required distinct 'principles' (and courses of study). To show the authenticity of the results obtained with this '2nd Law modeling', they are compared with results obtained with the 'traditional' models.