Formative Assessment

Do students understand that the volume of a liquid stays the same no matter what container holds the sample?

As the class discusses how they compared the volumes of A, B, and C, listen for evidence that students understand:

• The value of using identical containers to compare the volumes of different samples of liquids.
• That the volume of a liquid stays the same no matter what the shape of the container.

How would you interpret this student’s claim and evidence?

As a next step you might ask, “Is there ever a time when the volume wouldn’t be the same when you poured it into a different shaped container?”