Final answer:
Conservation is the logical thinking ability identified by Piaget referring to the understanding that a certain quantity remains constant despite changes in shape or container, relevant to the concrete operational stage of cognitive development in children aged 7 to 11 years.
Step-by-step explanation:
The term that refers to a logical thinking ability as described by Piaget, which allows a person to understand that a certain quantity will remain the same despite changes in the container, shape, or apparent size, is known as conservation. Jean Piaget, a famous developmental psychologist, identified this concept as part of the concrete operational stage of cognitive development that typically occurs from about 7 to 11 years old. Children in this stage grasp that even if the appearance of something changes, its size, volume, or amount remains the same unless something is added or taken away. For instance, when liquid is poured from one container to another with a different shape, children who have reached this stage will understand that the volume of the liquid remains constant.