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After our experiment we learned many important concepts of buoyancy from our results. In our results we saw that from changing the depth of certain objects, the buoyancy of the object does change a little bit. Another thing we observed in our results was the change of in volume came out very close to 25.

The point of our experiment was to test how much air objects needed to rise off the ground of the pool at different depths. We set up our expiriment in a way to try and make the least amount of error. We made the container big so it was hard for air to get out, and used a mustard container too be able to put in air slowly and get acurate results.
We found few errors and problems in our project. One problem we did have was seeing how much air was in the bucket because the lines were clear. Although we had a tough time seeing, we managed to copy down all the correct numbers. Another problem we ran into was that the tape would not stick to the bucket or the object because of the wetness. We overcame this problem by using electrical tape which worked very well in water. One of the hard things for us to do was making the strings equal length and also making sure the bucket was not lopsided. If the bucket were lopsided the air could escape easily or possible flip upside down, losing our results. An error that occurred many times was trying to spot where the object lifted off the ground. The reason this happened was because the object would move up and down from the bottom of the pool. In result we had to keep emptying air out of the bucket to get the correct answer which was very time consuming.

If we were to redo our experiment some of the things we would change would be drawing red lines on the bucket instead of clear lines, so we could see them under water. We need to be able to see under water because when we are bringing up the bucket with the air in it to the surface, the air expanded tampering with our results. When the bucket and the object are brought up to the surface, from 17 feet, the air had more pressure so it would expand more coming up. At 4 feet there is not as much pressure on the air in the bucket so it can't expand as much.
As you can see, in deeper depths you don't need as much air than at shallower depths. This information can be useful to a diver because at deeper depths they don't need to put as much air into their BC, to gain neutral buoyancy which helps to conserve air.
We think that for future experiments people should use hot and cold air. These results would be very interesting to see. You should do many trials and then use the correct formula to see how far off you were to the correct answer. This was a very fun and learning experience and would recommend other kids try it.