Answer: Concept of conservation
Explanation: The concept of conservation in psychology was laid out by psychologist Jean Piaget. This concept refers to the ability of perception and logical reasoning by which someone, in this case Ray, realizes that the amount of a fluid remains the same, even though the bowls in which that fluid has been poured are of different shapes and sizes. This means that Ray realizes that the liquid adapts to the shape of the bowl into which it has been poured.