# Why is change in volume of the solution zero in case of an ideal solution?

In my textbook it is written that $$ΔV_{mix} = 0$$ for ideal solutions i.e. $$V_{solution} = V_{A} + V_{B}$$. But why is this true? There is literally no explanation in my textbook as to why this is true. I am so confused. Please can someone explain it rigorously. Please help.

• In simple words because the average intermolecular interaction is the same in X, in Y, and in X+Y. It is the analogue of the ideal gases case. – Alchimista May 6 at 13:45