day 9 5.3.11 topic: finish convection, begin radiation obj: i can describe a draw a convection...
TRANSCRIPT
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Day 9 5.3.11
Topic: Finish Convection, Begin Radiation
Obj: I can describe a draw a convection current
Starter: Explain how a
radiator can heat a room.
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Natural convectionFluids expand when they heat up. In a container (or
environment), warmer fluid floats to the top and cooler fluid sinks to the bottom. This is called natural convection.
Forced convectionIn many houses a furnace heats air and then circulates
the air to rooms. Since the heat is being forced through the system (with blowers) and circulating with other air, this is another example of convection. However, since the air is forced to flow by the blowers or fans, this is called forced convection.
Convection (thru fluid) typesForced
Fan behind heat source
Heat Source
Forced
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Eureka
•Convection 27or
•Conduction 24
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Natural Convection Current Demo:“Shoe Box
House”
1st Floor
2nd Floor
Sketch Either image
Cool Air
Warm Air
Conclusion:As warm air rises and exits the house, cool air replaces the warm air which continues the convection current
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Ball & Ring Demonstration
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Thermal Radiation
• All objects with a temperature above absolute zero (-273 °C or -459 °F) emit thermal radiation. To emit means to give off.
• Thermal radiation comes from the thermal energy of atoms.
• Thermal radiation is also absorbed by objects. An object constantly receives thermal radiation, otherwise all objects would eventually cool down to absolute zero.
Three identical aluminum bottles were spray painted and set in the window.Predict the temperature of the fluid inside of each bottle using the oC.Justify your response.
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Eureka 29
ThermalRadiation
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Radiation: heat transfer in the form of electromagnetic waves, including light.
Sketch this image.
Reflects MOST Radiation Absorbs MOST Radiation &Emits as Heat Energy
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Thermal Radiation
Colors
• Black asphalt pavement gets very hot in the summer sun because it effectively absorbs thermal radiation. A silver mirror surface reflects most thermal radiation, while absorbing very little.
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Solar Radiation• Radiant Energy travels on waves through space on
particles or pure energy. Radiation is a heating mechanism
that takes place through electromagnetic waves.
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