Students sort objects according to whether they sink or float.

An experiment in density. After a review of floating and sinking of different materials, learners test four bottles, all holding four ounces of water, to see if they will float or sink. They each contain a different density of sugar...

For this activity, students make predictions about whether different objects float or sink, then test them. They are asked to record their observations and results for each, and compare their results to others'.

Students investigate water by estimating how long it takes to freeze, then see if the ice cube will float in water, and eventually work with other items to see if they sink or float in water.

A collection of interactives, videos, and documents on a variety science concepts.