Three unique ideas for science fair projects include color-changing carnations, creating a cloud in a bottle, and determining which frozen liquid melts the fastest. Each project is associated with a different subsection of science, including plant life, weather and temperature, in relation to the three states of matter.
To show how carnations change color, you need several bottles filled with water, various hues of food coloring and white carnations. Put a few drops of food coloring in each water bottle, then place a carnation in each. The flower should absorb the food coloring and display the color on its petals.
To create a cloud in a bottle, you need a plastic bottle, matches and warm water. Step-by-step instructions, along with a video tutorial, are available on the website for Planet Science, in the section titled Weather Experiments.