Analitic Essay

Background Information

Lab Report


Display Of Results







St. Matthew's School

Our experiment was designed to demonstrate how water pressure effects buoyancy. In our experiment we concluded that the buoyancy of an object would decrease as it is lowered to greater depths or pressure. Our problem statement states "How do different depths affect the buoyant force of exhaled air, carbon dioxide (CO2), helium, a wet suit hood, and a tennis ball". The helium was by far the most buoyant and the wet suit hood was the least buoyant. These results relate directly to scuba diving because, for instance exhaled air has buoyant forces as we found. Although a tennis ball does not relate at all to SCUBA diving, the wet suit hood and more specifically "neoprene" is very buoyant which makes it very hard to become neutrally buoyant. All you need to do to solve this problem is add more weight. If we were to redesign our experiment we would get a spring that is sensitive enough to detach the buoyant fore of a tennis ball.

The buoyant force of our objects was strong enough to get accurate readings with the spring scale on all objects except the tennis ball. The tennis ball showed no force at all on the spring scale so we included it to show one problem in our experiment we had but it did not count for a graph or anything. Our spring scale could not measure a buoyant force that was that small. The other difficulty we faced was time. If there is anything I would suggest to other groups at Pepperdine is, "hurry up". There isn't a lot of time so you need to get to the deep end and set up fast. There was not enough time to complete a lot of the objects at depths below nine feet, which was our biggest problem. In this experiment we learned that gases have more of a buoyant force than solid and even hollow objects, which depends on size. We also learned that every object, big or small, has a buoyant force, some more than others.

Buoyancy affects every endeavor in maritime life. The buoyant force exhibited by different objects is specifically important to divers. Obtaining neutral buoyancy is essential to divers. Buoyancy is one of the hardest things to master as a diver and our experiment demonstrates this.