What is Dry Ice Fog?
Copyright (C) 2004
Now, let me leave you with a question. How could you determine whether
the white "smoke" bubbling up from Dry Ice in water, is made of fine water
droplets, or fine ice crystals? |
(A thermometer is not the best answer. Do you know why?)
Perhaps you can devise a few experiments to determine this. They should be quite simple, if you think about what it is you are looking at. (Close your eye and see the things in your imagination. Visualize the tiny droplets and microscopic crystals. What happens to a ray of light when it hits each of them? What is the difference?) Now what else that you know the structure of, can you compare that with?
Maybe later, I'll have another experiment that determines which it is. Or something else of interest from my home page.
This kind of experimentation is not difficult to do using the kinds of low powered HeNe lasers available in many surplus electronics places. Mine is less than a milliwatt, perhaps a tenth of a milliwatt. Do take care to keep the laser beam from reflecting back to your eyes from shiny surfaces. And don't forget that steam is HOT, and Dry Ice is very COLD!
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