<img src="https://d5nxst8fruw4z.cloudfront.net/atrk.gif?account=iA1Pi1a8Dy00ym" style="display:none" height="1" width="1" alt="" />
Dismiss
Skip Navigation
Our Terms of Use (click here to view) and Privacy Policy (click here to view) have changed. By continuing to use this site, you are agreeing to our new Terms of Use and Privacy Policy.

Sublimation

State change from a solid to a gas without passing through liquid state

Atoms Practice
Estimated3 minsto complete
%
Progress
Practice Sublimation
Practice
Progress
Estimated3 minsto complete
%
Practice Now
Rock On

Rock On

 

Credit: Matt Garber
Source: http://www.flickr.com/photos/informant/375865746/
License: CC BY-NC 3.0

The success of a rock’n’roll group today depends not only on talent, but also on showmanship. Flashing lights, choreography, a specific “sound” – all contribute to the overall impact of the band. One typical effect used is the fog machine. Carbon dioxide (CO2) is generated to provide an other-worldly atmosphere to the performance. One advantage of CO2 is that it is heavier than air. This gas will sink to the ground and not dissipate rapidly.

Amazing But True

  • Carbon dioxide is a gas that makes up approximately 0.03% of the atmosphere. It is formed by decomposition of organic materials, by combustion of carbon compounds, and is released when we exhale.
  • Carbon dioxide can be solidified directly from the gaseous state and will transition directly from the solid state to the gaseous state (a process called sublimation).
  • Fog machines depend on a different set of chemical properties. A CO2 generator may be referred to as a fog machine, but technically it is a gas generator. A fog machine utilizes a mixture of materials that form a colloid and make a true fog.
  • Credit: Mike Spasoff
    Source: http://www.flickr.com/photos/clownfish/291072541/
    License: CC BY-NC 3.0

    Fog machines are often used in haunted houses to create a spooky atmosphere [Figure2]

     

  • Watch the video at the link below to see a demonstration of sublimation: 

https://www.youtube.com/watch?v=rWdLA9Iw1dc

Explore More

Use the links below to learn more.  Then answer the following questions.

  1. What is used in a machine that generates CO2 gas?
  2. What are two hazards associated with the use of dry ice for fog?
  3. What are the components of “fog” from a true fog machine?
  4. What are some properties of this “fog”?
  5. Why would this “fog” be considered to be a colloid?

Image Attributions

  1. [1]^ Credit: Matt Garber; Source: http://www.flickr.com/photos/informant/375865746/; License: CC BY-NC 3.0
  2. [2]^ Credit: Mike Spasoff; Source: http://www.flickr.com/photos/clownfish/291072541/; License: CC BY-NC 3.0

Explore More

Sign in to explore more, including practice questions and solutions for Sublimation.
Please wait...
Please wait...