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Heat Energy Lesson for Kids: Definition & Examples

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  • 0:01 Heat Energy
  • 0:50 How Heat Energy Works
  • 1:42 Ways to Transfer Heat Energy
  • 3:25 Lesson Summary
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Lesson Transcript
Instructor: Tammie Mihet

Tammie has taught elementary school for 14 yrs. and holds an MA in Instructional Technology

Heat - you experience it everyday, and it is essential for life, but have you ever thought about where it comes from? In this lesson, find out what heat energy is and three ways it can be transferred.

Heat Energy

Think about what your life would be like without heat. No more hot showers, hot food, or for that matter, no more warm sunlight to heat you up on a cold day! Imagine waking up in the morning and taking a cold shower, then eating a cold breakfast while sitting in your cold kitchen. Then getting in your cold car on a cold day, and heading to a cold school to sit in your cold classroom. What a crazy life that would be! Most of us take heat, a form of energy, for granted!

Heat energy, also called thermal energy, is the energy an object has because of the movement of its molecules, and heat can be transferred from one object to another object. Heat energy on Earth comes from the sun. Let's take a look at how this happens.

How Heat Energy Works

Everything on Earth is made up of molecules. Molecules are so small, you would need a very powerful microscope to see them. Molecules are always moving, and just like us, the more excited they get, the more they move. Do you know what gets molecules excited? Heat! When molecules get excited, they touch other molecules, heating them up, and getting them excited, too. This sharing of heat keeps spreading until all the molecules are the same temperature. Only then do they settle down.

For example, think about putting butter on a warm, flaky biscuit. The molecules in the biscuit are warm and vibrating all around. When the butter is placed on the biscuits, the molecules in the biscuit begin to heat up and excite the molecules in the butter, and the butter starts to melt. Heat energy is being transferred from the biscuit to the butter!

Ways to Transfer Heat Energy

Do you like popcorn? How do you like to pop it? Do you fix it in the microwave? Maybe you heat the popcorn up on the stove in a pan or use an air popper. Let's think about popcorn popping to help us understand how heat is transferred. We will look at three ways that this transfer, or spreading of heat energy, can happen: radiation, conduction, and convection.

Radiation

Heating through radiation, using a microwave, is truly the fastest and easiest way to pop popcorn! A microwave uses radiation, or waves, to heat things up. When you put a bag of popcorn in the microwave and press start, the microwave sends out heat waves. These waves hit the popcorn kernels and get them excited, heating them up, and causing them to pop.

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