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How do you feel in the sunlight? Warm!
Why? The Sun gives off: Light Heat
This heat and light is called … Solar Radiation: heat and light from the Sun
Solar Radiation is reflected and absorbed
Reflection: heat and light bounce off a surface
Absorption: heat and light are taken in by a surface
Solar radiation warms the Earth
Earths atmosphere protects us from most solar radiation
There is no atmosphere in space, so it can get very hot or very cold
Astronauts need extra protection in space from the extreme temperatures
Why else do astronauts need extra protection? No air No pressure space debris
What do Astronauts wear for protection in space?
The Experiment: why are space suits white? You will get two envelopes One light envelope One dark envelope
Place a thermometer inside each envelope
Place the envelopes in the light, record the temperatures, and predict how they will change
Graph your results! 100 ° F 90 ° F 80 ° F 70 ° F 60° F 0 mins 5 mins 10 mins 15 mins 20 mins
Write a Hypothesis: Which color do you think will get warmer and why?
Which envelope was warmer? The dark envelope! Why?
Dark colors absorb light: take heat in get hotter faster
Thats why black asphalt is so hot in the summer
Which envelope stayed cooler? The light envelope! Why?
Light colors reflect light: Heat bounces off Stay cooler
This is why astronauts wear light colored space suits!
Did You Know? Space suits also have built-in air conditioning to help keep astronauts cool!
Question of the Day… Does the absorption of sunlight lower or increase Earth’s temperature? 2. How does solar energy reach Earth? 3. Why should.
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Day 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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© Boardworks Ltd of 32. © Boardworks Ltd of 32.
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