Dry ice is a favorite mysterious Halloween material, perfect for spooking up a witch’s cauldron, but did you know that you can experiment with it too?
Dry ice is so cool (couldn’t resist!), and makes for a fantastic (ventilated) kitchen or outdoor experiment. Have you ever worked with it? The big caution is that you don’t want to touch it less it burns your skin. Got that? So it has to be handled with tongs and/or insulated gloves.
Read up on the cautions of using dry ice before proceeding, and always use your best judgment. I went through all the warnings with N, and the dry ice earned a great deal of her respect. She kept asking questions about how ice could burn us (it wouldn’t make sense to me either if I were her age), and was very curious about how it “smoked” on its way from our porch to the kitchen.
In case you’re wondering, I think it’s smart to introduce kids to “dangerous” things. They’re naturally curious about how the world operates, and given the proper instructions and parameters these introductions can give them a good foundation for critical and creative thinking. Have you heard of the The Dangerous Book for Boys or The Daring Book for Girls? I have a copy of the latter that I know N will love when she gets to be a bit older.
I found the dry ice at our supermarket, and asked the manager to help me pack it up. They come in big bags (perfect for cooling a fridge full of food, but far too much for this experiment), and I understand that they may break smaller pieces for sale…it sells by the pound at our market. To do this experiment, we used two pieces, each the size of a button mushroom.
I filled the bottom of this metal travel mug with about a cup of warm water, and dropped a piece of dry ice in with kitchen tongs. The ice makes a surprising sound when handled by the tongs!
The smoke is perfectly okay to touch.
Then we got fancy. N squeezed some dish soap into the mug.
And it got even more exciting with the addition of red food coloring.
And green, blue, and yellow food colorings, too!
This project is great for encouraging curiosity, setting the groundwork for scientific investigation (observation and experimentation), and building creative confidence. A+ in my book!
The Science behind Dry Ice
Dry Ice is frozen carbon dioxide, which dissipates into carbon dioxide gas when it melts. It’s called Dry Ice because it turns directly into a gas from its solid state, without ever becoming a liquid, and therefore there’s no puddle of water in its melted state. This process is called sublimation. Also, Steve Spangler Science is my new best friend, and it’s where I gleaned tons of good information for this post. If you like science experiments, do check this out.
More Ideas from Tinkerlab
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