The purpose of this activity model was to write the paper towel lab which had the National Science Education Standards referenced, both process and a content, and was written in the 5 E learning cycle format. Additionally, it has provided a nice forum on the distinctions between scientific experiments and investigations. By the end of the lesson the students will be able to determine which paper towel absorbs liquid the fastest through utilizing scientific investigation and science process skills.
Students will understand the concept of "wicking" cohesion-tension as applied to absorption in a paper towel and the process through the xylem in a plant. Students will develop conclusions based upon Investigation. Abilities necessary to do scientific inquiry. Students will know and utilize the major steps in scientific investigations. Students will use various science process skills including: A set of plastic graduated cylinders 10 ml to ml.
A set of syringes: Teacher The teacher should have a working knowledge of the "wicking"process that is used in plants to absorb water from roots to the leaves and structures of the plant. Specifically, the "wicking" process is defined in plant physiology as Cohesion-tension.
Water must travel more than m to reach the top of the tallest trees. Many experiments have shown that water from roots rises through root xylem to stem xylem to the xylem in the veins of leaves. This movement is against the force of gravity. Imagine that you are standing with along straw on top of a building three stories tall. The straw reaches into a bottle of root beer on the ground. No matter how hard you try you cannot suck the root beer up from the bottle, not even with a vacuum pump.
Water is thought to move by a process known as cohesion-tension. Under certain conditions, water can be pulled up a narrow tube if the water is in a continuous column. One condition is that the tube must have a very small diameter.
In small plants, the diameter is smaller than a human hair, but can be larger in larger plants as well. A second condition is that the tube must be made of a material to which water molecules will adhere. These two conditions exist within the xylem cells of plants. Water molecules exhibit cohesion - they are attracted to adjoining water molecules, thus forming an unbroken chain of water molecules in each xylem tube.
Tension is negative pressure that results from the pulling action of water molecules as they move out of the leaves during transpiration. The pull is transmitted through the column, and water is pulled from the roots up the plant to the leaves. Transpiration is the driving force of water transport, creating negative pressure that keeps water moving from the soil into the roots and up through the stems into each leaf.
If you put the dry paper towel into water, the water will travel up the paper towel utilizing the cohesion-tension part of the plant process. The paper towel fibers provide the small places for the columns of water to exist and for which to adhere.
The result is the "wicking" process which is observable in the paper towel. I hate how my cleaning cloths are greasy and black after cleaning the grill. Using cloth to wipe oil on a cast iron skillet leaves little pieces of cloth behind. Paper towels are so much easier for these jobs.
One of chickens laid an egg on the ramp to the coup. Before we could get the egg, the chickens knocked it off of the ramp.
It fell onto the wood on the side of their run and broke. I only had birthday party napkins to use to clean up the egg mess. You know the kind of napkins that fall apart if you do anything besides wipe your face with them. It took several napkins to clean the egg off of the wood and then we still had to spray the area with water.
You can find them at Walmart. Your email address will not be published. Leave a Reply Cancel reply Your email address will not be published. A few observations in this experiment were that the keys to a quality paper towel are absorbency, strength, and durability.
I found these by watching commercials and interviewing paper towel users. If the expensive paper towel is a better brand than the less expensive, then it should be able to soak up more water, be stronger, and more durable than the less expensive brand. Control and Variables and Materials: Procedure for Strength Test 1. Center paper towel on the rack and secure tightly. Add half a teaspoon of water to the center of the paper towel. Set the bowl gently on the wet spot. Place the one-ounce marbles one at a time in the bowl while counting out loud.
When the paper towel breaks, record how many marbles were in the bowl. Record your data in the graph. Repeat five times and find the average number of marbles. Repeat steps for the other paper towel brands. Procedure for Durability Test 1. Run a paper towel under water and gently wring it out. Carefully unfold the paper towel and tightly secure it on the rack. Place the bowl on the towel and carefully place in the one-ounce marbles while counting out loud.
When the towel breaks, record the number in your graph. Repeat five times and find your average. Calculate the percent of the original strength by dividing the average number of marbles from this test by the average number of marbles from the strength test.
Repeat steps for the other paper towels. Write down the brand names on a piece of paper. Write the cost for one roll. On the next line, write how many sheets per roll.
3 rolls of paper towels made by 3 separate brands. 1 large plastic tub; 2 cups of water; Notebook or journal; Graph paper; quarters; A partner; Steps: 1. Detach one towel from each roll of paper towels and label each one with the corresponding brand’s name.
Performing the Paper Towel Experiment Hypothesis “More expensive brands of paper towel are more absorbent.” What You Will Need for the Paper Towel Experiment. At least four brands of absorbent .
A few observations in this experiment were that the keys to a quality paper towel are absorbency, strength, and durability. I found these by watching commercials and interviewing paper towel users. If the expensive paper towel is a better brand than the less expensive, then it should be able to soak up more water, be stronger, and more durable. The purpose of this experiment is to prove which brand of towel is the best in absorbency and durability. The brands used during this experiment were Bounty(most expensive and most popular),Kroger (cheapest paper roll), and Brawny(not well known).
Experimental Design Bashaer Alkhafaji University Of Michigan- Dearborn. Experimental Design 2 much paper towels they really need by doing an experiment of which paper towel absorbs water the most. Also, this experiment will show them that the most absorbent paper towel will hold experiment. Constructing a graph After gathering my data. three different brands and analyze Analysis: In the paper towel experiment, each paper towel brand absorbed at least 46 mL of water. The most mL of water absorbed was by Brawny and the sheet absorbed 78 mL. Brawny's average amount of water absorbed is mL. The least amount of mL absorbed was by Scott and the sheet absorbed 38 mL.