Topic 1 & 2 Notes.

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Presentation transcript:

Topic 1 & 2 Notes

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

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

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

Andres Celsius http://www.youtube.com/watch?v=YWJHNG5y5F0

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

Kelvin Scale Named after William Thomson (given the title Lord Kelvin) Started at the coldest possible temp (absolute zero) -273.15 degrees celcius No one has ever been able to cool something to absolute zero Units are called Kelvins

Lord Kelvin

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

Thermocouple

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)

Bimetallic Strip http://www.youtube.com/watch?v=jAQmGKXk2q8

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

Infared Thermogram http://www.youtube.com/watch?v=SCdc4H9hd2c http://www.youtube.com/watch?v=XJB3RsrEe3c

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