# How can the entropy of a pure solid to be zero?

Jul 14, 2017

The third law of thermodynamics states that $\text{the entropy of a perfect crystal at 0 Kelvin is ZERO}$......
The existence of the third law allows us to deal with absolute entropies i.e. ${S}^{\circ}$ under standard conditions, rather than parallel values of $\Delta {H}^{\circ}$, where only enthalpy changes can be specified.