Hi everyone, Here is my version of laws of thermodynamics which I would like to share it with you and hear your feedback: Zeroth Law: More than being a law, it is a definition for temperature and it follows: Two systems are in thermal equilibrium iff (if and only if) they have the same temperature. First Law: Similar to the Zeroth Law, it hold a definition and a concept: Heat is energy and total energy of a system is conserved. Second Law: I call this the Dahh! Law because it says whatever is more probable happens the most, dahh! Here is the formal definition: For a closed system, the macrostate with the highest number of microstates is more probable to occur. Third Law: It can be considered as the complementary definition and concept for the Zeroth Law: As the number of available microstates (also entropy since 'S = k ln(w)') of a system minimizes, the inverse temperature value (i.e. β ≡ 1/T ) explodes to positive infinity. Comments are appreciated, Milad P.