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.
- Watch the video at the link below to see a demonstration of sublimation:
Use the links below to learn more. Then answer the following questions.
- What is used in a machine that generates CO2 gas?
- What are two hazards associated with the use of dry ice for fog?
- What are the components of “fog” from a true fog machine?
- What are some properties of this “fog”?
- Why would this “fog” be considered to be a colloid?