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## Heat Transfer

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### Heat Transfer Conduction, Convection, and Radiation Basic Guidelines Heat and Particle Movement Relationship Heat and Temperature Animated This simple animation ... – PowerPoint PPT presentation

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Title: Heat Transfer

1
Heat Transfer
• Conduction, Convection, and Radiation

2
Basic Guidelines Heat and Particle Movement
Relationship
3
Heat and Temperature Animated
• This simple animation shows what happens to these
spheres (blue and yellow) when the temperature
moves from 0 degrees Kelvin to 300 degrees
Kelvin.
• Note the speed of the smaller (yellow) particles
increases faster than the larger (blue) ones.

4
Heat Transfer
• Heat transfer is the movement of thermal energy
from a warmer item to a cooler item.
• Remember, heat moves in predictable ways, from a
high to a low.

5
Three Heat Transfer Situations
• Conduction
• Convection
• Radiation

6
Conduction
• Conduction is heat transfer through solids.
• Examples
• Your feet transfer (conduct) heat to a cold tile
floor
• A spoon placed in hot soup becomes warmer as the
spoon conducts heat away from the hot soup

7
Conduction examples
8
Convection
• Convection occurs in fluids
• A fluid is defined as a liquid or gas because
fluids have the ability to flow from one place to
another
• Solids, however, maintain their position

9
Convection continued
• Consider this - when you look at the road in the
summertime on a hot day, you may notice that the
air above the road looks blurry this is
convection taking place as the hot air directly
over the road absorbs the heat from the road and
rises. Although the explanation can be quite
complex, convection can help explain why mirages
are seen in the desert.

10
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11
Convection and Earth Science Connection
12
Radiation
• Question If conduction deals with solids and
convection deals with liquids, how does heat
arrive to Earth from the Sun?
• There is very little matter in between the Earth
and Sun.

13
Radiation Diagram
14
Radiation continued
• Heat can travel in waves without a medium (a
liquid, solid, or gas).
• Radiation is the term that describes heat
movement without a medium of matter.

15
The Electromagnetic Spectrum
16
Radiation continued
• All of the forms of electromagnetic energy in the
spectrum can travel through the universe as waves
we call this radiation.

17
Practical Applications
• Discuss and explain how potholes are formed
• Discuss the purpose of expansion joints on
bridges and elevated roadways
• Describe how a hot air balloon works
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