Nov 24, 2021
Good morning. My name is Abigail Naylor. And today we're going to be learning about buoyancy. Also known as water displacement. Now, Archimedes discovered buoyancy in 212 BC. It states that anybody completely or partially submerged in a fluid gas or liquid. At rest is acted upon by an upward buoyant force. Now there are three types of buoyancy, there is negative, positive, and neutral. Negative is when an object in the water tends to sink. While positive is when it stayed afloat. And then neutral is when it has a tendency to kind of do both. So for our experiment today, we are going to need two clear cups of water. I filled mine about equal to each other, and using room temperature water. The next, I'm going to need two eggs from your refrigerator, a spoon, and some salt. So this cup is going to be our control. We're not going to add anything to it. But this cup is going to have some salt. So let's go ahead and do that. Now I'm going to take my spoon and start to stir the salt. And hopefully dissolve most of it. Okay, I'm thinking that should be close to good, a few more stirs. All right. Seems pretty good. So the next step we're going to do is take our two eggs and place them in the water. So what we have from this experiment is negative and positive buoyancy. If we look at this cup, we see that the egg sank. So this is an example of negative buoyancy. But this cup, on the other hand, this cup our egg floats. This is actually an example of positive buoyancy. Because the water that the egg is displacing is actually heavier than the egg. Because salt has weight. So now that you've seen negative buoyancy and positive buoyancy and you have an understanding of what neutral buoyancy, I hope this video helped you. So thanks for joining me today. Have a good day.