A psychologist shows a child two glasses of water, equally full and of the same shape and size. Then she pours the water from one of the glasses into a taller, thinner glass and asks "Now which glass has more water?" The psychologist is apparently testing the child's concept of

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The psychologist is testing the child's understanding of conservation, which refers to the ability to understand that the amount of a substance remains the same even if it is rearranged in a different shape or container. This concept is typically developed around the age of 7.

A Psychologist Shows a Child Two Glasses of Water, Equally