Here's what some of the 5th graders have to say about density:
Hailey: There are many different things you can measure to find the density. It will either sink or float. You can use a solid, or liquid. If an object sinks it is more dense than the liquid you put in. If it floats it is less dense. When we tried to find liquids we used a graduated cylinder. If we were incorrect about which was more or less dense it would form under or on top.
Lakon: Density is whenever you put something in water or any other liquid if it floats that means that the object is less dense then the liquid but if it is more dense then the liquid it will sink.