1. The metal part gets hot enough to burn you! The cloth stays cool.
You park your car outside on a hot summer day. When you put on your seat belt, what do you feel?
The metal part gets hot enough to burn you! The cloth stays cool.

2. Specific Heat Capacity
Textbook definition: The amount of energy needed to change the temp. of 1 kg of a substance by 1˚ C.
In my own words: How easily something changes temperature.
High specific heat = hard to change its temp.
Low specific heat = easy to change its temp.

3. Which one has the highest specific heat capacity?
Substance
Specific Heat Capacity (J/kg  °C)
Lead
128
Gold
129
Silver
234
Metal of seat belt
500
Aluminum
899
Sand
800
Cloth of seat belt
1,340
Wood
1,760
Water
4,184

4. Example of specific heat capacity:
Why is it cooler at the beach in the summer?
Hint: Which has the higher specific heat capacity: the water or the sand?
Answer: Water has a high specific heat capacity, so the water stays cool longer than the land.

5. Heat Technology
Refrigerators- Cooling Takes Energy!
The refrigerator transfers thermal energy from inside the refrigerator to the condenser coils at the back.
This is why the back of a refrigerator feels warm!

6. Moves thermal energy from inside the house to the outside
Heat Pumps
Devices that move thermal energy from one location to another.
Example: Air Conditioner
Moves thermal energy from inside the house to the outside

7. Answer: Yes, so it takes energy to do it!
Wait? Doesn’t that go against the rule that heat always moves from hotter to colder?
Answer: Yes, so it takes energy to do it!
Air conditioner

8. Heat Engines – Machines that use heat to do work
Heat Engines – Machines that use heat to do work. They convert thermal energy into kinetic energy.
Heat Engines
Internal
External

9. Internal Combustion Engine- Fuel burns inside the engine in chambers called cylinders.
Example:
car engine

10. External Combustion Engine- Fuel is burned outside the engine.
Example: steam engine