Supercooled Water Freezes Instantly

Liquid rapidly turns to slushy ice. Ask students to predict what will happen. Tap bottle or pour onto ice. Key idea: Water below freezing can remain liquid until a nucleation site starts crystal growth. Ask: Why didn't it freeze in the freezer already? Safety and cleanup: Use plastic bottle; practice timing. https://www.sciencebuddies.org/science-fair-projects/project-ideas/Phys_p033/physics/supercooling-water-and-snap-freezing