# Thermodynamics --- **Thermodynamics** is a branch of [[physics]] that deals with heat, work, and temperature, and their relation to [[energy]], [[radiation]], and physical properties of [[chemistry|matter]]. ## The Laws of Thermodynamics ### The Zeroth Law *If two systems are each in thermal [[equilibrium]] with a third, they are also in thermal equilibrium with each other.* ### The First Law The law of conservation of [[energy]]. *The total energy of an isolated system is constant; energy can be transformed from one form to another, but can be neither created or destroyed* #### Seven Principles of the First Law - Conservation of Energy - The total energy of a system is equal to three separate components, kinetic energy, potential energy, and internal energy. - and some more too... ### The Second Law All systems tend toward chaos. *Heat does not spontaneously flow from a colder body to a hotter.* In other words, in a closed system [[entropy]] does not decrease. If a system is initially low-entropy, its condition will tend to slide [[endergonic and exergonic|spontaneously]] toward a state of maximum entropy. Once this state is achieved, the system is in [[equilibrium]], and does not re-order itself. ### The Third Law *As the temperature of a system approaches absolute zero, all processes cease and the [[entropy]] of the system approaches a minimum value.* ___