1. Topic 1 & 2 Notes

2. Thermal Energy The energy generated by the movement of particles
The faster the particles move, the more heat is created

3. Thermometer: Device for measuring temperature
Invented by Galileo (early 17th century)

4. Celsius Scale Used in Canada Named after Anders Celsius
Measures in degrees
Standards based on properties of water (Freezing and Boiling)

5. Andres Celsius

6. Pressure effects the boiling and freezing points of water
Under lower pressure, water boils below 100 degrees
In Alberta, high altitude makes water boil several degrees below 100

7. Kelvin Scale Named after William Thomson (given the title Lord Kelvin)
Started at the coldest possible temp (absolute zero) degrees celcius
No one has ever been able to cool something to absolute zero
Units are called Kelvins

8. Lord Kelvin

9. Thermocouple Wires made of two different metals are twisted together
When the wire tips are heated to different temperatures, a small electric current is created
Can be used for very high temp, but does not measure low temp accurately

10. Thermocouple

11. Bimetallic Strip Two different metals joined together
As the metal is heated, one expands more than the other and the strip coils
As the strip cools, the expanded metal contracts rapidly and the strip uncoils again
Movements of the strip can operate as an electrical switch (furnaces, fridge, etc)

12. Bimetallic Strip

13. Infared Thermogram
Anything warmer than absolute zero gives off infared radiation (IR)
Infared radiation can be detected by electronic sensors that display the images on a screen
The color of the infared image shows the temperature of the object

14. Infared Thermogram http://www.youtube.com/watch?v=SCdc4H9hd2c