What is about a material that makes it more or less absorbent?
In: Chemistry
There are two real factors here: Hydrophilicity and surface area. Hydrophilic surfaces have stronger molecular forces pulling water to them. Meanwhile, surface area dictates how much water can get close enough to the material for this force to become significant. A towel, for instance, is made of many tiny fibers, all of which attract water quite a bit. A teflon block, on the other hand, has a very smooth surface and does not attract much water.
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