In an effort to showcases how various substances diffuse through membranes, an experiment was performed. Frist, we weighed the mass at the start, to compare it with the weight at the end, and they were expected to gain mass. We left the experiment for a week and left it to diffuse. We then weighed the bags none of them gained mass, which may suggest a random (water stuck in the knot) or systematic (scales) error. We then tested for the substances outside of the tubing and we were excepting to find glucose and salt outside but not starch as the molecule is too big. Generally, the results proved to be reliable in some aspect, i.e. the expected results of glucose and salt found outside the tubing in the surrounding water, but none of the tubes