一、认识儿童的心理行为发育 Conservation of Number One of the rows is stretched out.The child is asked correspondence.The child admits their equality whether each row still has the same number. 8 2 Conservation of Length the child. He or she 3. Conservation of Area The child and the experimenter both have identical amount of space remaining. A 4.Conservation of Substance One of the balls is rolled out.The child is asked whether they still contain equal amounts 5.Conservation of Volume o balls of ciay are placed in two identi ＋ ﹢/- 一、认识儿童的心理行为发育