Heat and Temperature.

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Presentation transcript:

Heat and Temperature

Heat vs Temperature Energy Transfer as Heat  Heat = energy transferred from one object to another because of a difference in the objects’ temperature.  Temperature = measure of the avg. kinetic energy of the individual atoms or molecules in a substance (more movement = warmer temperature)

Energy Transfer as Heat  Three mechanisms of energy transfer as heat are: conduction, convection, radiation Fig 9 pg. 483: A pot of water on the campfire illustrates the 3 mechanisms of heat transfer

Conduction: the transfer of heat through matter by molecular activity. ***Think “Direct Contact”

2. Convection: the transfer of heat by mass movement or circulation within a substance. ***Think “Hot stuff goes up and cold stuff goes down” WHY??????

3. Radiation: the transfer of energy (heat) through the vacuum of space by electromagnetic waves that travel out in all directions. (this is how solar radiation reaches Earth) *** Think “Heat spreading out”

What Happens to Solar Radiation?  When radiation strikes an object, there usually are 3 different results: 1. Absorbed: (Converted to heat = temp. increase). 2. Transmitted: Energy passes through. During this, energy can be scattered, producing a large number of weaker rays 3. Reflected: Some radiation may bounce off the object without being absorbed or transmitted. Reflected radiation has the same intensity as incoming radiation Solar Cookers !!! Explain why these work!!

Electromagnetic Spectrum Makes no sense without caption in book