Mixing in hot water: Observational Experiment

Aim

Try and construct a model of why things mix.

Description of the Experiment

A drop of dye is placed in a beaker of hot water. Observe what happens to the dye. The movie is played at twice times normal speed. Carefully note how long it takes for the dye to mix into the water.

Youtube movies can be stepped frame by frame using the , and . keys on your keyboard. If you want to download the movie to your computer, right-click or control-click HERE.

Questions

• Consider what you observed here. Is it consistent with you model of mixing so far? If so, then good. If not, then try and refine your model to explain what you observed.
• Again, consider what things are necessary for the dye to be able to mix as it does?