What does second law of thermodynamics mean?
• SECOND LAW OF THERMODYNAMICS (noun) The noun SECOND LAW OF THERMODYNAMICS has 1 sense: 1. a law stating that mechanical work can be derived from a body only when that body interacts with another at a lower temperature; any spontaneous process results in an increase of entropy Familiarity information: SECOND LAW OF THERMODYNAMICS used as a noun is very rare.