Washington Middle School seventh graders recently discovered more about density in Kay Eklum’s science class. After making predictions, students estimated the density of different objects by observing whether they sank or floated in water. Students then determined the actual density of objects. First, they found the mass of an object on a triple beam balance. Then, they determined the volume by using either water displacement or a metric ruler. Finally, students calculated the density by dividing the mass by the volume.