00:00 - 00:40

Lisa builds a "perpetual motion machine," and Homer scolds her for violating the laws of thermodynamics.


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When Mark loses power on Mars, he scavenges the Rover 1 to double his battery life. It is freezing cold, and he is faced with a dilemma: use the heater to stay warm and burn through half his battery every day, or slowly die from the cold to save battery life.
The class goes to Water Land and learns about how water changes when it is exposed to different amounts of heat. When water is heated by the sun, it evaporates. When it is cooled, it condenses.
Mr. Wizard explains and demonstrates convection currents.
Bill Nye explains that heat is energy and can be used to do work, such as keep up warm, run an engine, or affect other molecules. Using real-world examples, he then describes the three ways that heat can move from one place to another: conduction, convection, and radiation.
Beakman breaks down the meaning of the word to aid in remembering what it means. Once explaining that molecules make up water, he uses an animated clip to liken molecules to cars racing around. He shows the different speeds of the cars in hot vs. cold water and how they balance out if put together. Then there is a song about thermodynamics.