For this project, you’ll be conducting an experiment. What makes fog? The project, itself, is a simple one and will only take about 2 to 3 hours to complete. This is a very good topic for science fairs if you’re willing to do a bit more research than “hands on” experimentation.

Necessary Items:

*Journal

*Pencil

*2 empty pop bottles

*Hot water

*Cold water

*2 ice cubes that can be lodged in the neck of the pop bottles.

Directions:

Step 1: Empty and rinse out your soda bottles.

Step 2: Label one soda bottle with the word “Cold” and one with the word, “Hot”.

Step 3: Take your bottle that says, “Cold” and fill it about a quarter of the way up with cold water. Once you have the water in your bottle, wedge the ice cube into the neck of the bottle (Do not let the ice cube fall into the bottle. It must remain lodged in the neck) and watch to see what happens. Use your journal to record your findings.

Step 4: Take your bottle that says, “Hot” and fill it a quarter of the way up with hot water. (The water does not need to be boiling. Simple hot water from your tap will suffice.) Now place an ice cube into the neck of the bottle labeled “Hot”. Watch closely and record your findings.

Note: Fog will be produced in one of the two bottles. This simulation represents the production of radiation fog. As your project, you can document and record your findings and explain why this happens.