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In this activity, learners discover the primary physical properties used to separate pure substances from mixtures.

In this activity, learners can create five-layer density columns by employing one of three (or all) methods.

It's difficult to see convection currents in any liquid that's undergoing a temperature change, but in this Exploratorium Science Snack, you can see the currents with the help of food coloring.

Focus sound through a balloon! In this Exploratorium activity, you'll use dry ice to create a balloon that's a sound lens.