The Correct Answer and Explanation is:
A sponge.
A common use for a porous, water-absorbing mass of fibers is as a sponge for cleaning or bathing. The description in the question perfectly outlines the essential characteristics that make a sponge effective for these tasks.
The term “porous” refers to the network of tiny, interconnected holes and channels that permeate the sponge’s structure. This high porosity is a critical feature, as it creates a large internal volume. This network allows water, soap, and other cleaning solutions to be drawn readily into the sponge’s core and held there until needed.
The “water-absorbing” quality is a direct result of this porous and fibrous nature. A physical phenomenon known as capillary action actively pulls liquid into the countless small spaces between the fibers. This process is so efficient that a sponge can soak up and hold a volume of liquid many times its own dry weight. This remarkable capacity is central to its function in any cleaning task, whether it is absorbing a small kitchen spill or holding soapy water to wash a car.
Finally, the phrase “mass of fibers” accurately describes the material composition. Natural sea sponges are the flexible, fibrous skeletons of simple marine animals. Synthetic sponges, which are more common in modern households, are typically manufactured from processed cellulose wood fibers or various plastic polymers. In both natural and synthetic versions, this intricate web of fibers creates a vast internal surface area. This structure not only maximizes the sponge’s capacity for absorption but also provides a gentle abrasive texture, ideal for scrubbing away dirt and grime without scratching most surfaces. Therefore, its use in cleaning and hygiene is widespread and fundamental.
