Heat Transfer.

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Presentation transcript:

Heat Transfer

What is Heat? Heat is the movement of atoms in a substance Heat always moves from hotter object to colder object

Heat is transferred 3 ways: 1. Conduction–heat transferred by touching molecules conductors: transfer heat well (metals, cement) insulators: transfer heat poorly (wood, plastic, air) Examples: Frying eggs Hot spoon in soup Bare feet in snow

Heat is transferred 3 ways: 2. Convection: heat circulating through liquids or gases Hot air/water rises! When it cools, it sinks. This creates a circular motion

Heat is transferred 3 ways: 2. Convection: heat circulating through liquids or gases Hot air/water rises! When it cools, it sinks. This creates a circular motion Examples: Hot top bunk Steam rising Hot air balloons

Heat is transferred 3 ways: 3. Radiation: heat transfer with infrared waves feeling heat without touching only way heat can move in a vacuum how the sun heats the Earth Examples: Roasting Marshmallows Heat lamps Dog laying in the sun

The 3 Types of Transfer

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