In this lesson, you will explore how ingredients go from ingredients to a baked good (the final product). Before completing the "Energy Forms and Changes" simulation below, watch the following video: http://youtu.be/0M1lVfNzbPE?hd=1
Questions:

• What happens when you put a hot object in cool water?
• Explain the heat flow you see in this simulation? 

Flow of Heat Vocabulary

• Thermal Energy: The internal kinetic energy of a substance (the energy from the movement of the molecules, atoms, etc., moving in a substance).
• Temperature: The measure of the thermal energy in a substance; temperature is the average kinetic energy of the particles in a substance.
  
• Heat: The change in thermal energy of substance, measured by a change in temperature.
  

How Does Heat Transfer Occur?

Temperature is the average kinetic energy of the particles in a substance. Thermal energy is transferred from one object to another by the collision of particles. The object with a higher temperature has faster moving molecules. When these molecules collide with an object that has a lower temperature, and thus a slower moving molecules, they will transfer some of their thermal energy to the slower moving molecules. Therefore, the colder object’s molecules will gain some thermal energy, while the hotter object’s molecules will lose some thermal energy. The colder object’s molecules will speed up a bit, and hotter object’s molecules will slow down a bit. Thermal energy ALWAYS flows from areas of high heat to areas of low heat, and this can be stated in the following ways:

• Thermal energy flows from areas of high energy to areas of low energy.
• Thermal energy flows from areas of high temperature to areas of low temperature.
• Thermal energy flows from areas of fast moving molecules to areas of slow moving molecules.

Overall, the thermal energy is transferred from the hotter object to the colder object. NEVER the other way around.

Convection, Conduction and Radiation

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• Conduction: Transfer of heat by direct contact.
• Convection: Movement of heat by motion of matter.
• Radiation: Transfer of energy with the help of electromagnetic waves.

BruceBlaus, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons

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