The failure to understand quantity conservation is a key feature of which of Piaget's stages?

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According to Piaget's theory of cognitive development, the failure to understand quantity conservation is a key feature of the preoperational period. Children in this stage are typically between the ages of 2 and 7 and struggle with the concept that the amount of a substance remains the same despite changes in its shape or appearance. They may believe, for example, that a tall, narrow glass contains more liquid than a short, wide glass, even if both contain the same amount. This is because they have not yet developed the ability to mentally reverse actions or think logically about transformations.

The Failure to Understand Quantity Conservation Is a Key Feature