What we do talk about are changes in enthalpy. And in order for changes in enthalpy to exist, we must assign zero values to Cherton atoms with the churchin's elements, okay? And in fact, under a standard state of 1 bar or 750 tor and a certain temperature such as 25 degrees Celsius, all elements such as diatomic, hydrogen diatomic, oxygen, carbon diatonic, fluorine and so on are assigned a value of zero entropy, zero joules per mole. Okay? So when a reaction or a compound is created from its constituents or from its raw elements, there's a change in entropy. And this change in entropy is known as the standard entropy of formation.