Sohee knows that a round ball of clay has the same amount of clay as a hot dog made of clay. She reasons that they have equal mass because, although the clay as a hot dog is much shorter than the ball, it is also much longer. Sohee is demonstrating the type of reversibility known as

Question

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Sohee is demonstrating the concept of compensation, which is the understanding that changes in one aspect (e.g., length) can be offset by changes in another aspect (e.g., width or thickness) to keep the overall quantity (in this case, mass) the same.

Sohee Knows That a Round Ball of Clay Has the Same