Separation is a term to describe the distance between particles
Alchemy symbols have not just been used for elements across the ages but also to represent compounds and experimental techniques in chemistry.
Changes of state happen when solids, liquids and gases change between each other due to energy being added or taken away.
Alchemy symbols are illustrations that have been used by alchemists for hundreds of years to communicate between alchemists about different elements and scientific methods in the pursuit of alchemy. It was also used as a way to protect their discoveries and findings as often they were only known by a few people.