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Heat and heat energy are terms we use to describe the level of activity for the molecules in an object. An object with molecules that are very "excited" and move around rapidly is known as being hot, while an object with molecules whose atoms move around less rapidly is known as cold. The heat energy, or thermal energy, can be transferred between objects. So, heat refers to this energy transfer between objects, while temperature refers to the energy contained within the objects. There are three basic ways to transfer heat energy: convection, conduction, and radiation. Convection transfers heat energy through gases or liquids. Conduction transfers heat energy from one solid to another. Radiation transfers heat in the form of waves or particles through places where there are no molecules. It is a form of electromagnetic energy. Here are some common examples of heat energy.
So, heat energy comes from an object or substance whose molecules and atoms are moving faster due to a rise in temperature. Now you have seen lots of examples of heat energy, the next time your pet climbs into your lap, you can experience first-hand how heat energy works. Read about how some objects can store potential energy, ready to be released in different ways. Open in App Suggest Corrections 2
View the video below to see what you and your students will do in this lesson.
Students will be able to explain that cooling water can change it to ice and that heating ice can change it back to liquid water. Students will be able to explain that this process can also happen to other substances. Students will also be able to explain that heating a substance makes its molecules move faster and cooling a substance makes its molecules move slower. The lesson can also be used to lay a foundation for learning about changes in state and chemical changes which can be further developed in later grades. Key Concepts
NGSS Alignment
Summary
EvaluationDownload the Student Activity Sheet (PDF) and distribute one per student when specified in the activity. The activity sheet will serve as the Evaluate component of the 5-E lesson plan. SafetyBe sure students wear properly fitting goggles. Materials for each group
Explain to students that when water freezes, it changes from a liquid to a solid.
Show the time lapse video Water Freezing. Note: Tell students that this is a special type of video in which something that takes a long time can be shown in a much shorter time. The freezing of the water in the glass probably took at least six hours. The video was taken for the whole six hours but is shown speeded up so that the freezing process can be shown in about 1 minute. Tell students that this type of video is called “time lapse”.
Ask students
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