___is the mixing of substance with another duets

Answer 1

The term you might be looking for is "dissolution," which refers to the process of a substance (the solute) being incorporated into another substance (the solvent), resulting in a homogeneous mixture. If you meant a more general term related to mixing, "blending" or "combination" could also be appropriate, depending on the context. If you have a specific context in mind, please provide more details!