http://www.ck12.org Chapter 2. Matter
Sublimation of Snow and Ice
Snow and ice may also undergo sublimation under certain conditions. This is most likely to happen where there
is intense sunlight, very cold temperatures, and dry winds. These conditions are often found on mountain peaks.
As snow sublimates, it gradually shrinks without any runoff of liquid water. At the URL below, you can watch a
time-lapse video showing sublimation of snow on the highest mountain in the Andes.
http://www.youtube.com/watch?v=7_p9LOTUIDQ
MEDIA
Click image to the left for use the URL below.
URL: http://www.ck12.org/flx/render/embeddedobject/79977Summary
- Sublimation is the process in which a solid changes directly to a gas without going through the liquid state.
Solid carbon dioxide is an example of a substance that undergoes sublimation. - Snow and ice undergo sublimation under certain conditions. This is most likely to happen where there is
intense sunlight, very cold temperatures, and dry winds.
Vocabulary
- sublimation: Process in which a solid changes directly to a gas without going through the liquid state.
Explore More
Read the short article about sublimation at the following URL. Be sure to examine the two graphs comparing changes
of state in water and carbon dioxide. Then answer the questions below.
http://astronomy.swin.edu.au/cms/astro/cosmos/s/Sublimation
- How is air pressure related to the sublimation of solids?
- Other than on Earth, name two places in the solar system where sublimation occurs.
- At normal sea level pressure on Earth, at what temperature does solid carbon dioxide sublimate?
Review
- What is sublimation? Give an example.
- Describe conditions under which snow or ice is most likely to undergo sublimation.
- The plastic container pictured in theFigure2.44 is filled with solid air freshener. The solid gradually shrinks
after the holes in the top of the container are opened. Explain why this occurs.