7 Pages

The Emergence and Development of Formal Operations

At 14: 6 (Another child) ' ... the water is dislodged by the weight (in A): It comes into equilibrium at a certain moment because the weight of the water (in B) increases when it rises.' 'What makes the water rise?' 'The weight of the boxes; it makes a greater pressure at the bottom of the tube and that dislodges the water.'