Lesson 2: Methods of Heat Transfer

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Presentation transcript:

Lesson 2: Methods of Heat Transfer

Discovery Education Video: Physical Science: The Basics - Energy Energy exists in a variety of forms and can be transformed from one kind to another. Heat is one type of energy. On Earth, energy comes from a variety of sources, including the sun and falling water.

Thermal energy can be transferred from one object or substance to another. Rapidly moving molecules in a warm object can “excite” molecules near the object causing them to begin moving more rapidly as well.

As the rapidly moving molecules hit the slower molecules they will behave similarly to pool balls being struck.

Thermal energy can be transferred by three different methods: Conduction Convection Radiation

Discovery Education Video: The Movement of Heat Heat energy can be transferred in three ways: conduction, convection, and radiation.

Discovery Education Video: Heat Transmission: Conduction, Convection, and Radiation

Conduction is the process by which heat is transferred by contact between two objects.

Examples of Conduction:

Convection is the process by which heat is transferred by a current of water or gas.

Examples of Convection:

Radiation is the process by which heat is transferred through air or space by electromagnetic waves.

Examples of Radiation:

Examples of Heat Transfer

Key Questions: 1. Can an object transfer heat by more than one method at the same time? Explain and give an example. 2. Why is heat transfer by radiation necessary for life on earth? 3. Based on what you know about convection, describe how you think a "convection oven" would work.