Density & Buoyancy

Density In Gases, Liquids & Solids

In this first video we'll get into what density means, and the densities of some common liquids, gases and solids. We'll also dig into why things float, and how liquids and gases can "float" on top of each other based on their relative densities and specific gravity.

Density Calculations

After the previous video introduced the concepts of density, this video is all about calculating actual numbers. Not only will we calculate density, but we'll rearrange the density formula to solve for volume and mass as well. Also covered: hard mixture problems where you have to find the density of a mixture.


It's easy to say, "The buoyant force is equal to the weight of the fluid displaced," but it's much harder to apply that to boats, boulders, submarines, balloons and bricks that may or may not be in a foam cooler. Lots to cover here, but after this you won't look at a boat the same way again!