Entropy

Topic Description

Upon completion of this module, you should be able to define entropy, explain what is meant by a state function, and describe the first, second, and third laws of thermodynamics. Entropy (S) is a measure of the magnitude of the randomness or disorder of a system. If a chemical or a physical change results in an increase in randomness, the entropy change, delta S (?S), is positive. If there is a decrease in randomness, the entropy change, delta S (?S), is negative. The solid-state of any substance is more ordered than the liquid state. The liquid state of any material is more ordered than the gas state.