Biology Lab Write Up

Topics: Surface tension, Drop, Liquid Pages: 1 (266 words) Published: April 24, 2013
Paper Towel Absorbency Experiment Write-Up
The purpose of this experiment is to conduct a valid experiment, realize that the way I conduct an experiment influences the data, and I want to know which paper towel has the higher absorbency times. My hypothesis is that bounty will be the quicker picker upper Materials and Methods:

As a class we chose that our control out of the brands provided (Bounty, Viva, Wal-Mart, and the School brand) would be the Schools brand of paper towel. The treatment I used was to drop one drop of water onto the paper towels using a pipette and I timed it until I saw the water had stopped spreading on the paper towel. To randomize our data we had a sheet of random numbers that we used and we had four cases of replication, which went like this: •Rep 1: Bounty, School, Wal-Mart, Viva

Rep 2: Wal-Mart, Bounty, Viva, School
Rep 3: Viva, Wal-Mart, School, Bounty
Rep 4: School, Viva, Wal-Mart, Bounty
Other materials we used besides the paper towels were:
A pipette
An iPhone stop-watch
And a three inch by two inch piece of each paper towel
Figure 1: Average absorbency times
Based on the results I received from my experiment my hypothesis was proven correct. Bounty was faster than the other brands ether dramatically or just by tenths of a second. Some things that could have affected my data though where the accuracies in my timing, or my visuals of the stop of the spreading of the water droplet.
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