This project depicts a simple cellular automata model that appears to be a pot of boiling water. Heat is applied evenly to the entire pot, but when the temperature of a patch reaches the boiling temperature, the bubble pops and that patch's temperature drops to zero. This process is analogous to the way in which a hot enough region of water gives up some heat by forming a bubble of steam. The water right around the steam bubble cools off for a moment.
For detailed instructions on using the program, take a look at the info window from the Boiling model.
Click on one of the pictures to see a quicktime movie of the model: