I place two same?sized glasses of liquid (container A and B) in front of a child and ask: Which has more, or are they the same? The child correctly states that they have the same amount of liquid. I now pour the liquid from container B into container C (a tall thin glass). I now ask the child which has more, container A or C, and the child says, "C has more." You would expect all of the following to be true, except

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Quizplus · Accepted Answer

The child is likely in the preoperational stage of development, not the concrete operational stage. The preoperational stage (typically ages 2-7) is characterized by difficulty in understanding the concept of conservation and focusing on one aspect of a situation (height of the liquid) rather than understanding that quantity remains the same despite changes in shape or appearance.

I Place Two Same?sized Glasses of Liquid (Container a and B)