Students also learn that if an object is more dense than water it will sink when placed in water, and if it is less dense than water it will float. Download the student activity sheet and distribute ...

These “moss balls” are popular pets in Japan ... and in graduated cylinders in the lab. But why do they float in the daytime and sink at night? A newly published paper by Dora Cano-Ramirez ...

Some objects float in water and other sink. But did you know that you can change whether something floats or sinks by adding a substance to the water? Let's try it and see! Pour water into a cup until ...