1. Heat Transfer

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

3. 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

4. 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

5. 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

6. 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

7. The 3 Types of Transfer