Hooked on Science: Make spooky fog for Halloween

With a little dry ice you can create the spookiest Halloween ever.

Materials

* Dry ice

* Warm water

* Bowl

* Gloves

Instructions

STEP 1: Fill the bowl halfway with warm water.

STEP 2: Put the gloves onto your hands and place a piece of the dry ice into the warm water and observe.

Explanation

When you placed the dry ice into the warm water, a cloud formed above the bowl. Dry ice is frozen carbon dioxide and is minus 109.3 degrees. As dry ice breaks down it turns directly into carbon dioxide gas. This process is called sublimation.

Jason Lindsey is a Science Outreach Educator with Hooked on Science. Check out his website Hooked On Science at hooked onscience.org for webcasts and experiments that might get you hooked on science. Send him your science questions at jlindsey@hookedonscience.org. More science experiments can be found at www.semissourian.com.