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 ...

What: Earlier this summer we learned about density. Density is the amount of mass in a given volume, or amount of space. Mass is dependent on the number of molecules in an object. Objects that are ...

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...

*Refers to the latest 2 years of stltoday.com stories. Cancel anytime. Q Why do some logs float and some sink? — Holden Taggart, Merrimac, Wis. A Rodney Schreiner, chemistry department, University of ...

Whether an object floats or sinks in water is determined by the ratio of its weight compared to its volume. If an object of a certain volume weighs more than an equal volume of water, it sinks because ...