When one variable increases, the other decreases?

Question

What is the specific name of this correlation? I don't think it's a direct correlation, I just don't remember what else there was...

Answer 1

inverse ratio or inverse coorelation

Answer 2

E = MC^2

C is the constant speed of light 300 million meters per second

If E (energy) increase and the speed of light is constant, that means that M (mass) must decrease, via verse.

E (energy) and M (mass) have an "inverse" (diametric) correlation.