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Heat Energy

Energy passed as heat from one object to another

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Heat always passes from a hotter object to a cooler object

If you hold an ice cube in your hand,

it will start to melt

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Heat energy passes from your hand to the ice cube

The heat energy makes the molecules in the ice move faster

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The ice begins to melt,or become a liquid

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Heat energy can be passed in 3 ways

1.Conduction2.

Convection3. Radiation

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Conduction

Heat passes through solids

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When one object passes heat to another by conduction,

The heat keeps flowing until both objects are equally hot

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Have you ever eaten hot soup with a metal spoon?

After a while, the spoon gets hot

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The hot soup causes the molecules in the spoon to move

faster

Heat travels from the soup up the spoon to your hand

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Convection

Heat passes through liquids and gasses in currents

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Molecules in liquids and gases move apart when they are

heated

This happens during convection

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When you heat water on the stove,

The bottom layer of water is heated first

The molecules in this layer of water move farther apart

Then floats to the top, and the cooler, heavier water on the top

falls to the bottom

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These molecules are called convection currents

In winter, convection heats the air in your house

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Radiation

Movement of heat energy in waves

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Solar heat comes in radiation waves

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Microwave ovens heat food byradiation

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Heat energy can be passed in 3 ways

1.Conduction - contact2. Convection - current3. Radiation - waves