The dehydrated gel from this activity is very hygroscopic - it can soak up (absorb) a LOT of water. This type of gel would be good for making materials drier because it absorbs water so well. A cracker is an example of a hygroscopic material.
An example of absorption is a paper towel cleaning up spilled water. Not all materials will absorb water.
The dehydrated gel is also used to transport plants over long distances - it absorbs water, keeping it near the plant's roots. This is the same gel used for disposable diapers, because the gel absorbs moisture quickly.
When water changes from liquid to gas, it is called evaporation.
Dehydration means removing the water from something.
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