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Blue sky – red sunset

Blue sky – red sunset



Science Experiment on the Sky

Science Experiment on the Sky



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    Blue sky – red sunset Blue sky – red sunset Presentation Transcript

    • Blue sky – Red sunset Yu Weiran(33) 1A3
    • Aim
      • When the sky is not cloudy, it is blue in colour.
      • When the sun is setting, it is red.
      • Why is this so?
    • Equipments
      • A flashlight
      • A transparent container with parallel sides
      • 250ml of milk
    • Steps
      • Set the container on a table where you can view it from all sides.
      • Fill the container to quarter full.
      • Light the flashlight and hold it against the side of the container so its beam shines through the water.
      • Try to see the beam as it shines through the water. (It is not easy)
    • Steps
      • Add about 60 millilitres of milk to the water and stir it.
      • Hold the flashlight to the side of the container, as before.
      • Notice that the beam of light is now easily visible as it passes through the water.
      • Then, add the rest of the milk.
      • You will realise that the beam of light have became blue.
    • Pictures of the experiment Start
    • Different views of the setup
    • Why is this so?
      • When the beam of a flashlight travels through air, we cannot see the beam from the side because the air is uniform. (Light travels in a straight line)
    • Why is this so?
      • When milk is added into water, more particles are added into the water.
      • Milk contains many tiny particles of protein and fat suspended in water.
      • These particles scatter the light and make the beam of the flashlight visible from the side.
    • Colour of light
      • Different colors of light are scattered by different amounts.
      • Blue light is scattered much more than orange or red light.
      • Because we see the scattered light from the side of the beam, and blue light is scattered more, the beam appears blue from the side.
      • Because the orange and red light is scattered less, more orange and red light travels in a straight line from the flashlight.
      • When you look directly into the beam of the flashlight, it looks orange or red.
    • Sunset and Clear Sky
      • The light you see when you look at the sky is sunlight that is scattered by particles of dust in the atmosphere.
      • Looking at the sky is like looking at the flashlight beam from the side
      • When you look at the setting sun, it's like looking directly into the beam from the flashlight.
    • Sunset and Clear sky
      • At sunset or sunrise, the sunlight we observe has traveled a longer path through the atmosphere than the sunlight we see at noon.
    • Experiment Adaption
      • A Handbook for Teachers of Chemistry Volume 3 by Bassam Z. Shakhashiri