Surface tension is another fun concept to explore with your kiddos! Because water molecules have a greater attraction to one another than they do to the air molecules above/surrounding them, a 'barrier' of sorts is formed on the surface of the water which can actually allow things that are more dense than water to float! Materials plastic cup water pepper cotton ball dish soap Completing the Lab 1. Provide students with a cup of water, sprinkling pepper into the cup and inviting your...