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ZingPath: Conservation of Energy

Conduction, Convection and Radiation

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Conservation of Energy

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Lesson Focus

Conduction, Convection and Radiation

Physics

Learning Made Easy

You will be able to learn about the conservation of energy laws through real-life examples. Perform experiments with falling objects and calculate the changes in mechanical energy that occur.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain how heat is transferred by conduction.
  • Explain how heat is transferred by convection.
  • Explain how heat is transferred by radiation.

Everything You'll Have Covered

Explain how heat transfer occurs through conduction.

~ Heat (thermal energy) is transferred from the hotter part of an object to the cooler part. The faster particles in the hot part of the object conduct their energy to the particles in the cool part. This is the way the transfer of heat by conduction occurs. Conduction occurs in all states of matter - solids, liquids and gases. Solids are the best conductors, while gases are the worst.

Explain how heat transfer occurs through convection.

~ Liquids and gases are poor conductors, but they can make heat (thermal energy) travel quickly from one point to another. When liquids or gases are heated from the bottom, the lower particles become warmer, expand, and become less dense. So they rise. Then the denser, cooler particles sink downward, thus changing places with the hotter particles. Then the cooler particles heat up. This thermal circulation of particles is called convection. Convection does not occur in solids.

Explain how heat transfer occurs through radiation.

~ When waves of heat (thermal energy) travel through empty space and transparent mediums, heat transfer by radiation occurs. Solids, liquids, and gases can all be heated by radiation.

Explain how a pot of water heating on a gas stove uses all three methods of heat transfer.

~ When a pot of water is heated on a gas stove, heat waves in the form of radiation travel up to the pot to heat the metal. Through conduction, the whole pot becomes warm and heated. With the passage of time, the water in the pot is heated through convection.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should have a general understanding of the following terms: conduction, convection, and heat.
Course Physics
Type of Tutorial Animation
Key Vocabulary conduction, convection, heat