# Heat Transfer.pptx

9 de May de 2023
1 de 10

### Heat Transfer.pptx

• 2. Thermal Energy • Energy is the ability to make things move or change. • All matter (anything with mass that takes up space) is made up of tiny particles that are always moving. • Thermal energy is the energy of the moving particles. This energy is felt as heat. Thermal Energy = Heat
• 3. Heat • Heat ALWAYS moves from a warmer object to a cooler one. This movement is called heat transfer. • As heat moves into an object, it becomes warmer. As heat moves out of an object, it becomes cooler.
• 4. Heat Transfer • When a freshly made cup of coffee is sitting on a counter, it will lose heat because the air around it is cooler than the coffee. • When an ice cube is sitting on a table, the warmth in the air will transfer into the ice cube, melting it.
• 5. Heat Transfer • There are 3 ways that heat can transfer to other objects. These methods of transfer are called conduction, radiation, and convection.
• 6. Conduction • Conduction is the transfer of heat between things that are touching. • When two things that are touching have different temperatures, heat will move from the warmer object to the cooler one. Examples: • Hands are warmed when holding a hot mug of cocoa • A hot stove burner warms a pot sitting on it. • Can you think of some other examples?
• 7. Conductors • Conductors are objects that allow heat to move through them easily. • Metals are good conductors because they allow heat to move through them easily. Examples of metals include iron, silver, copper, aluminum, and stainless steel. • For example, if you were at a campfire and you put a stick in the fire, your hand would not burn. Wood is not a good conductor. If you left a metal spoon in a hot pot on the stove and held the spoon, your hand would burn.
• 8. Convection • Convection is the transfer of thermal energy through liquids or gases. • Warmer air and water rises and cooler air and water sinks. This creates a convection current. Click the picture below for a convection demonstration.
• 9. Radiation • Radiation is the transfer of energy through electromagnetic waves. • Radiation from the sun heats objects on Earth. Heat travels from fire to objects through radiation as well.