Earth science · 7 lessons · 10 quick hits

Water and density

Layers that refuse to mix, dye that behaves strangely in salt, and what that means for the oceans.

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  1. Lesson 115:12Density Column with TWO IngredientsSimple density science experiment that you can try at home to see how liquids and objects with different densities behave.
  2. Lesson 25:38Changing Concentration Effect on Buoyancy, Density and ConcentrationHow does changing concentration effect buoyancy and density? Why do the balloons float to different levels when they all were taken from salt water at the same location?
  3. Lesson 34:26Best Salt Water Density Experiment Ever (Maybe)Add tons of salt to water and many nearly invisible layers of salt water of different densities form.
  4. Lesson 41:39Why does DYE do this in SALT?Do you know what happens when Dye and Salt mix? I wasn’t sure what would happen when I mixed red and blue dye with salt at the bottom of the beaker. Can you explain the results?
  5. Lesson 56:47Best Diffusion Experiment Ever! (Maybe...)When you pop a water balloon underwater does the water stay in one place or spread out?
  6. Lesson 613:50The strange behavior of a saturated salt solutions (and what it might mean for the worlds oceans)In this experiment we add excess salt to water and explore the associated temperature change as well as the saturated salt layer that forms above and around the salt.
  7. Lesson 717:57What if you block H-bonds? (Penny drop Experiment)Have you ever wondered how many drops of water fit on a penny?

Quick hits

Under a minute each. Good for a "watch this" before dinner.