A snowman, glass of water and steam might look very different but they are made of the same stuff! Just like any substance, water can exist in three different forms, called states: solid, liquid and gas. The state will change when the substance is heated. As a solid, a substance has a fixed volume and … Read more
Last Updated: March 19, 2026 at 11:48 pmThe second law of thermodynamics states that the entropy of an isolated system never decreases because isolated systems spontaneously evolve towards thermodynamic equilibrium—the state of maximum entropy. Equivalently, perpetual motion machines of the second kind are impossible. The second law is an empirically validated postulate of thermodynamics, but it can be understood and explained using … Read more
Last Updated: May 21, 2019 at 3:31 am