Rate of Diffusion Lab
In this lab, we tried to find out the relationship between surface area, volume, and cell permeability. In class, we discussed the question of why cells needed to be so small, having an average size of just a few micrometers*. So, we conducted an experiment to try and find this relationship. Using agar cubes of different sizes, 3 cm, 2 cm, and 1 cm respectively, we covered all three cubes and waited for ten minutes. After that time, we removed the cubes and observed the changes. As it turned out, the smallest cube had completely changed color, while the other two cubes had been partially permeated with the vinegar. This result led to the conclusion that smallest cells, or more specifically, cells with a greater surface area to volume ratio, would be easier to diffuse into.
* Go to http://learn.genetics.utah.edu/content/cells/scale/ to learn more about the size of the cell compared to other small objects.
* Go to http://learn.genetics.utah.edu/content/cells/scale/ to learn more about the size of the cell compared to other small objects.