Entropy - Energy Education - Fossil Fuels  ## Metadata - Author: **Fossil Fuels** - Full Title: Entropy - Energy Education - Category: #articles - URL: https://energyeducation.ca/encyclopedia/Entropy#:~:text=Entropy%20can%20also%20be%20described,a%20specific%20amount%20of%20energy. ## Highlights - Entropy can also be described as a system's thermal energy per unit temperature that is unavailable for doing useful work.[3] Therefore entropy can be regarded as a measure of the effectiveness of a specific amount of energy.