1. HEAT 11.2

2. Chapter Eleven: Heat
11.1 Heat
11.2 Heat Transfer

3. Chapter 11.2 Learning Goals
Compare and contrast various methods of heat transfer.
Differentiate between thermal conductors and thermal insulators.
Explain what it means when objects are in thermal equilibrium.

4. The Specific Heat of a Metal
Investigation 11B
The Specific Heat of a Metal
Key Question:
What is the identity of an unknown metal sample?

5. 11.2 Heat transfer
Thermal energy flows from higher temperature to lower temperature. This process is called heat transfer.
There are three ways heat flows:
heat conduction,
convection, and
thermal radiation.

6. 11.2 Heat transfer
Heat conduction is the transfer of heat by the direct contact of particles of matter.
Conduction occurs between two materials at different temperatures when they are touching each other.
Where is the heat energy conducted to and from in this system?

7. 11.2 Heat transfer
Thermal equilibrium occurs when two bodies have the same temperature.
No heat flows in thermal equilibrium because the temperature is the same in the two materials.

8. 11.2 Thermal conductors and insulators
Materials that conduct heat easily are called thermal conductors and those that conduct heat poorly are called thermal insulators.
Is a down coat a conductor or an insulator?

10. 11.2 Convection
Convection is the transfer of heat through the motion of matter such as air and water.
The hot water at the bottom of the pot rises to the top and replaces the cold water.

11. 11.2 Convection
Convection is mainly what distributes heat throughout a room.

12. 11.2 Thermal radiation
Heat from the Sun is transferred to Earth by thermal radiation.
All the energy the Earth receives from the Sun comes from thermal radiation.
The higher the temperature of an object, the more thermal radiation it emits.

13. 11.2 Thermal radiation Thermal radiation is also absorbed by objects.
The amount of thermal radiation absorbed depends on the surface of a material.
Dark surfaces absorb most of the thermal radiation they receive.
Silver or mirrored surfaces reflect thermal radiation.

14. 11.2 Heat transfer, winds, and currents
A thermal is a convection current in the atmosphere.
When a surface, like a road absorbs solar radiation, it emits energy as heat.
The warmed air molecules gain kinetic energy and rise.
Colder air is forced aside and sinks.

15. 11.2 Thermal radiation
There are giant convection currents in Earth’s atmosphere.
The global wind patterns and Earth’s rotation also cause surface ocean currents to move in large circular patterns.

16. Mass Determination Investigation 11C Key Question:
Can the mass of an object be determined without the use of a balance?

17. Needed: Efficient Buildings
“Green” building design is the term used to describe architecture that is energy-efficient and environmentally friendly.