Why Dry Ice Makes Fog

Dry Ice for Fog or Smoke Special Effects

When you put dry ice in water, sublimation occurs more quickly and fog is produced.
Andrew W.B. Leonard, Getty Images

Why you put a piece of dry ice in water, you'll see a cloud of what looks like smoke or fog billow away from the surface and down toward the floor. The cloud is not carbon dioxide, but actual water fog. Here's what happens:

How Dry Ice Produces Water Fog

Dry ice the solid form of carbon dioxide, a molecule that is found as a gas in air. Carbon dioxide has to be cooled to at least -109.3 °F to become a solid.

When a chunk of dry ice is exposed to room temperature air it undergoes sublimation, which means it changes from a solid directly into a gas, without melting into a liquid first. Under ordinary conditions, this occurs at the rate of 5-10 pounds of dry ice converting into gaseous carbon dioxide per day. Initially, the gas is much colder than the surrounding air. The sudden drop in temperature causes water vapor in the air to condense into tiny droplets, forming fog.

Only a small amount of fog is visible around a piece of dry ice in air. However, if you drop dry ice in water, especially hot water, the effect is magnified. The carbon dioxide forms bubbles of cold gas in the water. When the bubbles escape at the surface of the water, the warmer moist air condenses into lots of fog.

The fog sinks toward the floor both because it is colder than the air and because carbon dioxide is more dense than air.

After time, the gas warms up, so the fog dissipates. When you make dry ice fog, the concentration of carbon dioxide is increased near the floor.

Ready to try it yourself? Here's how to make dry ice fog, safely.

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Helmenstine, Anne Marie, Ph.D. "Why Dry Ice Makes Fog." ThoughtCo, Feb. 7, 2017, thoughtco.com/why-dry-ice-makes-fog-606404. Helmenstine, Anne Marie, Ph.D. (2017, February 7). Why Dry Ice Makes Fog. Retrieved from https://www.thoughtco.com/why-dry-ice-makes-fog-606404 Helmenstine, Anne Marie, Ph.D. "Why Dry Ice Makes Fog." ThoughtCo. https://www.thoughtco.com/why-dry-ice-makes-fog-606404 (accessed January 21, 2018).