This project is based upon molecular force and the degree of surface tension, which depends on the amount of energy in the intermolecular forces. Liquids that produce strong intermolecular forces have a strong surface tension. Soap bubbles are made up of soap molecules and water molecules. A soap bubble has a polar end and a nonpolar end.
Water is a polar molecule.
The polar end of the soap molecules are attracted to each other. The nonpolar ends of the soap molecules stick out from the water and help hold bubbles together. Float a razor blade or needle on water in a Petri dish on the overhead projector. Surface tension supports the object. Float in a low, wide container of water.