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A simple experiment to show/prove sublimation is by using pottasium permangenate(solid) . All you need is a conical flask with a fairly long neck. Drop the pottasium permangenate into the conical flask and seal the mouth of the flask. Hold the flask to a flame from a bunsen burner. The heat from the burner should make the pottasium permangenate sublime into it's gaseous form producing a purple coloured gas. Then once it reaches the neck of the flask it will lose it's heat and cool down to form pottasium permangenate crystals.
And there you have it!
A simple experiment of sublimation.....
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irrrom
