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General Physics Science Fair Project

What Color Light Shines the Brightest Through Fog?

What Color Light Shines the Brightest Through Fog? | Science Fair Projects | STEM Projects
Let's find out which color light will shine the brightest through a foggy liquid. We'll use a jar, some milk, water, a flashlight, and a light meter to measure the intensity of the light.


The hypothesis is that yellow light will shine the brightest through the liquid because yellow light has the longest wavelength.

Method & Materials

You will need to buy colored cellophane wrap and rent or buy a light meter. Then, get a jar and remove the label. Cut different colors of cellophane wrap and fold them into squares. Fill the jar with water and add two teaspoons of milk to the water. Stir milk and water to form a cloudy liquid. Put the light meter behind the jar and the flashlight in front of the jar. Shine the flashlight through the cloudy liquid into the light meter. Put different colors of cellophane wrap film over the flashlight to make different colors of light.
You will need a jar with no label, milk, water, a flashlight, cellophane wrap colored film, and a light meter.


The results showed that yellow light shone the brightest through the fog. This confirms our hypothesis that yellow light has the longest wavelength.

Why do this project?

This science project is interesting because it shows how different colors of light interact with foggy liquid.

Also Consider

Experiment variations to consider include using different liquids, such as juice or oil, and using different colors of cellophane wrap.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

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