As a ball of clay is squeezed and shaped,an adult is aware that it retains the same volume.What is the term for this Piagetian principle

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The principle of conservation is the understanding that an object's basic properties remain the same even if its appearance has changed. In this case, the volume of the ball of clay stays the same even though its shape has been altered.

As a Ball of Clay Is Squeezed and Shaped,an Adult