Experiment 54 from We Are Teachers - 75 Easy Science Experiment

54. String up some sticky ice

You need an ice cube, a piece of string, and some salt. Lay the string on the ice cube, sprinkle a little salt on top, and wait a few seconds. The salt melts the ice slightly, and as it refreezes, the string stick. This shows how salt affects melting and freezing and demonstrating the concept of freezing point depression.