Three ways to model a reactor
LensaSim gives you three reactor models, and choosing the right one is a real skill.
A Conversion reactor is the bluntest: you tell it what fraction of a reactant reacts. An Equilibrium reactor is smarter: you give it a reaction and it finds how far it goes from the equilibrium constant K(T). The Gibbs reactor is the most powerful: you specify no reactions at all — it minimizes the total Gibbs free energy and predicts the equilibrium composition from the elements alone.
Conversion (you set extent) → Equilibrium (K decides) → Gibbs (predicts everything).