During science we have been learning about buoyancy with Mr Proctor. We learnt that buoyancy is the ability to make an object float in water. We also got taught that that if the object is heavier then the water it will sink but if it’s denser than the water it will float.

So far we have done two experiments. The first one was to see if an egg would float in water. Mr Proctor showed us two glasses of water, both with an egg inside. One of them sank and the other floated. We then had to figure out how this happened. The answer was that one of the glasses had salt in them and the other didn’t. The egg in the glass with salt floated because the water was heavier than the egg.

We were placed into pairs and given an empty glass, a raw egg and a small cup of salt. We were then told to try and get the egg to float. You could win by having the clearest water. This could be achieved by mixing the water as much as possible. You could also win by having your egg float to the top of the glass the fastest.

The second experiment we done was with cans. There were three cans one had 7 up, the other one had diet coke and they last one had coke. The cans were placed in water. The 7 up and diet coke floated but the coke sank. This was because coke had much more sugar then the other two cans which meant that it was heavier then the water. We went into groups and tried to get the 7 up and diet coke to float and the coke to sink. We were then judged.

Both the experiments were very fun and everyone seemed to enjoy it.

–Irina