1. HEAT

2. What is Temperature?
Temperature is the average kinetic energy of the particles of an object.
As temperature increases , kinetic energy of the particles increases.

3. How is temperature related to the movement of the particles?
The faster the particles of an object move, the higher the temperature of the object.

4. Which particles are moving faster, those in a cup of hot tea or iced tea?

5. What is thermal expansion ?
Thermal expansion is the increase in the volume of a substance due to an increase in temperature .

6. What is the official SI unit of temperature?
Kelvin

8. Temperature conversion formulas
Celsius to Fahrenheit: oF = (9/5 * oC) + 32
oC  0F
Fahrenheit to Celsius: oC = (5/9) * (oF – 32)
oF  0C
Celsius to Kelvin: K = oC + 273
oC  K
Kelvin to Celsius: oC = K – 273
K  oC

9. Fill the missing blanks using the previousoF oC K
Water boils
100o
Body Temperature
37o
Room Temperature
68o
Water freezes 0o
Absolute zero

10. What is absolute zero? The lowest temperature on Kelvin scale
(zero Kelvin)
At this temperature particles stop moving.

11. What is heat?
Heat is the transfer of energy between two objects that are at different temperatures.
When two objects of different temperature come in contact, energy is always transferred from the higher temperature to the lower temperature.

12. What is thermal energy?
Thermal energy is the total energy of the particles that make up a substance. It is measured in Joules.
Which one has more thermal energy?

13. What is thermal equilibrium?
Energy is transferred from the higher temperature object t o the lower temperature object until both objects reach the same temperature.

14. What are conductors?
Conductors are substances that conduct thermal energy.

15. What is an insulator?
An insulator is a substance that does not conduct thermal energy .

16. How is heat transferred?

17. Heat and temperature change

18. Thermal conductivity
The rate at which a substance conducts thermal energy.

19. Specific heat capacity
The amount of energy needed to change the temperature of one Kg of a substance by one degree Celsius.

20. Specific heat capacity of different materials:
Silver
234
Copper
387
Glass
837
Wood
176
Steam
2010
Ice
2090
Aluminum
899
Water
4184

21. Matter and heat States of matter
Three states of matter: solid , liquid and gas.

22. heat technology Heat engines A machine that uses heat to do work.
Heat engines burn fuel to produce thermal energy in a process called combustion.
There are two types of heat engines: external combustion and internal combustion heat engines.

23. External combustion: fuel is burned outside the engine.
Internal combustion: fuel is burned inside the engine.

24. Cooling system
Cooling systems are used to transfer thermal energy out a particular area so that is feels cooler.
Question:
Will leaving the refrigerator door open on a hot day help to cool the kitchen?