In this experiment, we'll use dry ice (solid carbon dioxide, CO2) to investigate what happens when a solid turns directly into a gas, a process known as sublimation. Because dry ice is extremely cold and can potentially be dangerous, this experiment requires adult supervision. Never touch dry ice with your bare hands for more than a few seconds.
Sublimation is much different than what we're used to seeing from a solid: can you imagine ice in a glass of water turning directly into steam? It turns out that dry ice undergoes sublimation because the pressure of earth's atmosphere simply isn't strong enough for carbon dioxide to exist as a liquid.
Hmm... it seems nobody's added a conclusion for this experiment yet. You can suggest one here.