chem‧is‧try S2 [uncountable]
the science that is concerned with studying the structure of substances and the way that they change or combine with each other [↪ biochemistry, biology, physics]
if there is chemistry between two people, they like each other and find each other attractive
It's obvious that there's a very real chemistry between them.
the way substances combine in a particular process, thing, person etc:
a person's body chemistry