write the experiment conduct by Swetha the absorption of water with different brands of paper towels
Answers
Answer:
Hypothesis
Materials needed
3 (or more) different brands of paper towel (Note how much they cost)
graduated cylinder (if you don’t have one use a skinny glass and measure the water you pour in and what is left using a measuring jug)
tap water
aluminum pies dish or a tray to prevent a mess
Procedure
1. Gather needed materials
1. Gather needed materials2. Lay all paper towels on top of each other and use scissors to trim so they are all the same size (this way you’re testing how the absorbency of the towels differ and size isn’t a variable). You will need 3 pieces of each brand.
3. Take 1 paper towel from brand A and roll lengthwise so its diameter can fit in the graduated cylinder
3. Take 1 paper towel from brand A and roll lengthwise so its diameter can fit in the graduated cylinder4. Fill the graduated cylinder with lukewarm tap water to a volume of 30ml. (Note: we use metric measurements as that is standard in the scientific community).
5. Put a rolled paper towel in the cylinder so 3cm of the towel is submerged in the water
6. Hold the towel in water for 10 seconds, then lift it up out of the cylinder and allow to drip into the cylinder for 5 seconds. (The purpose for doing this was to make sure the test showed what the paper towels were absorbing AND keeping in. After all, you don’t want towels that drip out everything you’ve just cleaned up!)
7. Either dispose of paper towel in a waste bin OR place in pie pan and throw them all away at once when you finish
8. Record the volume of water remaining in the cylinder and subtract from the original 30ml to see how much water the towel absorbed
9. Repeat steps 3-8 two more times with the same brand of paper towel.
10. Now take the next brand of paper towel and do steps 3–9.
Conclusion
Now that you have the data, and the graph, students can reach a conclusion. They need to decide if their hypothesis was supported by the data or not (NOTE: scientists never say their hypothesis was ‘true’ or ‘false’ but only whether the result of their experiment supported the hypothesis or not)
The Science Behind It
Paper towel is made of plant fibers. Capillary action in the fibers draws the water into the paper towels. If you have a microscope, put a piece of paper towel under it for your children to look at. The fibers are made up of tiny linked sugar molecules called cellulose. Cellulose attracts water. If you look at paper towel under a microscope you will also see that there are spaces between the fibers – and those will hold water too.
To take this one step further, take a look at how much each roll of paper towel cost and try to calculate the cost of one “test strip” for each. Relate the cost to how absorbent the brand was and that should help you select what to buy in the future.
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aim: to know the absorbity of different towels
apparatus: three beakers, towelpieces,water
procedure: take three beakers and pour 1 liter of water into each of the three beakers.put a towel from each of the three brands into different beakers for 10 seconds.pull the towel out of the water and let it drain back into the beaker for 5sec. Now measure the amount of water left in each beakers .
observation:we observe that beakers with water show different levels of water.
conclusion: the towel placed in a beaker that shows lowest level of water is a good brand for absorbing water