Existing users log in here or new users sign up here.

Nature of Matter



Making tea in hot and cold water: Testing Experiment


Use your model to predict what will happen if one teabag is placed in hot water and the other is place in cold water.

Description of the Experiment

One teabag is placed in a beaker of hot water and another teabag is placed in a beaker of cold water. Predict which one will make a beaker of tea first. The answer is probably familiar just from your every day experience, but try to use your mixing model to make as precise a prediction as possible. The movie is played at seven times normal speed.

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.


  • Consider what you observed here. Was your prediction correct?
  • Look carefully at how the tea colour mixes into the water when the camera zooms in on the cold beaker. Does what you see agree with your model?