A teacher shows two identical glasses filled with an equal amount of juice. She empties them into two different glasses, one of which is taller and the other is wider. She asks her class to identify which glass has more juice. The students reply that the taller glass has more juice. Her students have difficulty in dealing with:

According to Jean Piaget, mathematical knowledge is primarily acquired through:

How does Piaget's theory explain children's process of learning mathematical concepts?

A Class 2 teacher notices that when she pours water from a short, wide glass into a tall, thin one, her students insist that the taller glass holds more water. Based on Piaget's theory, which stage of cognitive development are these students most likely in, and what concept are they struggling with?