A soggy project from Science Buddies Show Key concepts Introduction But could there be a way to conserve some of that paper by getting a paper towel to go the extra mile, allowing you to dry your hands with just one single sheet? This activity just might help you find the answer. Background Paper towels are made of ground-up plant material. If you look through a microscope at a torn-up piece of paper (or look up some images on the Internet), you will see a web of tiny plant fibers. Magnifying your paper further will reveal that the fibers are made of long chains of linked sugar molecules, called cellulose. Water is attracted to cellulose and likes to be soaked up and stick to the cellulose in paper. When you looked through your microscope, did you also see the spaces between the fibers? These empty spaces affect the absorbency of the paper: Water likes to stick together and fill these spaces as it follows the water attracted to the cellulose. More spaces allow more water to be absorbed. But what would happen if you add a tiny space between sheets of paper towels? Would the empty space between the sheets help to hold more water? Materials
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Observations and results Paper is made of cellulose, which water molecules like to cling to. As a result, paper readily absorbs water. Paper towels are especially absorbent because their cellulose fibers have empty spaces—tiny air bubbles—between them. Water molecules, which like to stay together, follow the one another as they are absorbed by the cellulose and fill the empty spaces. Layering the paper towel creates more spaces for water to fill, which explains why your layered paper towel could hold more water and was more efficient at drying your hands. The next time you reach for the paper towels, remember to fold! You might feel good knowing you just saved an extra paper towel from being used. Cleanup This activity was inspired by the TEDx talk, "How to Use One Paper Towel," by Joe Smith. More to explore This activity brought to you in partnership with Science Buddies ABOUT THE AUTHOR(S)What paper towel brand soaks up the most water?In our absorbency tests, Viva proved to be #1. These cloth-like paper towels were able to absorb the most liquid out of every brand tested, while also picking up spills quickly. Viva paper towels were also the softest paper towels, according to our consumer testers.
What type of paper absorbs the most water?We found out that paper towels and toilet paper were the most absorbent- the water soaked into the these types of paper really quickly.
Do thicker paper towels absorb more water?If a towel is thicker, it has more fibers to absorb water with! The fibers in tissues and paper towels are made of cellulose molecules—big molecules that consist of lots of tiny sugar molecules chained together.
Do more expensive paper towels absorb more water than cheaper ones?The engineers at Consumer Reports recently tested 27 brands of paper towels for absorbency and wet strength. In general, the premium-priced towels, both one-ply and two-ply, were more absorbent than the lower-priced brands or store brands. Absorbency alone doesn't help much if the towel takes too long to get wet.
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