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Assuming you have your dry ice by now, let’s get into our first demonstration.
Remember, wear your safety glasses and gloves. Do not ever put dry ice in your mouth. It will burn!!
Using a pair of kitchen tongs, grab a chunk of dry ice (listen to the screeching sound when the metal touches the ice) and place it on a dish. On another dish, place an ordinary ice cube. Then ask the kids which one will melt first. Fairly basic stuff, but the kids will learn that the ice cube will turn from a solid into a liquid, while the dry ice will disappear completely. It is important for students to understand that dry ice doesn’t obey the same laws of nature.
The most famous thing you can do with dry ice is to drop it in water. Something I learned from a special effects artist was to fill a metal drum half full with water, drop some dry ice into it to produce “smoke” “steam” or “water vapor”. The warmer the water, the more water vapor it made. Turning on a fan blew all of that water vapor out.
For your own experiment, start with warm water for great bubbles and water vapor. I like to use a beaker because I have no fear that it will crack, so find a container that is not going to break. A Pyrex mixing container would be ideal.
Remember, you don’t want there to be any possibility that a child can touch the dry ice, so keep the container away from them.
I have found a plastic graduated cylinder that scientists use. I half fill this with water, add a couple of drops of food coloring, drop a chunk of dry ice into it, and watch the bubbling action. Sometimes I like to take some of those light sticks, break them up and drop into the container.
These are ideas to add to your bag of tricks that are a little different from what other people do.
Take a long cylinder, or a bigger container, add a squirt of liquid soap and almost instantaneously, the bubbles will rise. But instead of seeing water vapor, all that steam is trapped inside the bubbles. It is fun to reach up and touch the bubbles as they emerge from the container, because when you pop them, all that steam emerges from the bubbles. It is almost impossible, especially with young children, to keep them from coming forward to touch the bubbles. It is a great way to occupy the kids for hours. This is your secret weapon!
If you are a middle school teacher, there are other ways to produce different color effects, like using cabbage juice.
I even thought it would be great to use dry ice to produce clouds at our wedding. My wife always reminds me on our wedding anniversary of the incredible special effects, like filling the room with “steam” and having our guests coughing and spluttering, when a whole 30lb of dry ice was dropped into a 55 gallon drum of warm water, just as we completed our vows. I do! I do! Then Cloud Nine!
Happy Halloween everyone! And stay safe!
Listen to my podcast where I share some of my favorite dry ice demos
(File size is 3.6 MB) (Show length 15 minutes 23 seconds)
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