Paper towels achieve remarkable absorbency by mimicking the structure of a sponge. The fibers are arranged in a loose, interwoven pattern that creates thousands of microscopic pores.
When liquid contacts the towel, it enters these pores and is drawn upward by capillary action. Each tiny cavity forms a small “bubble” held together by surface tension, allowing the water to cling to the fibers rather than pooling.
Squeezing the towel compresses the pores, collapsing the surface‑tension “bubbles.” The water molecules are forced to coalesce and fall under gravity, so the towel expels the liquid.
These principles explain why paper towels are so effective at cleaning spills and wiping surfaces in everyday life.
