# Buoyancy

This picture on the mind-map is all about the Buoyant force, Gravity, Fluids, Volume and Displacement.

A Buoyant force is an upward push that fluids give to any object you toss in. The Buoyant force don’t resist force the way solids do. It is because the gravity pushes it back when you hit a solid block. It doesn’t seem that when you put your hands inside a liquid (water), the force is reacting to your hand. But in reality, fluids do react. For example, When you dunk a beach ball into a pool, it takes a lot of effort. But when you let it go, it’s lifted by the buoyant force. Fluids are any substance that flows or that have on fixed shape. For example, like water and other liquids. Also, when you put a solid block in a pool, it slowly sinks to the bottom of the pool. When you weigh an object that is in the pool, it is as twice as light on the ground.

When you put something in a pool, some water moved to make room for the object. It’s easier to see in a cup of water. For example, if you put a cube of ice into the water, the water rises to make space for the ice cube to be inside the water. That is called Displacement. Displacement means that the displaced water and the object take up the same amount of space. Meaning that the Volume is exactly equal. A volume is a the amount of space that an object or a substance fills; the amount of space that a container has. The thing is that if an object weighs 125 lbs (on land) – 70 lbs (in water) = 55 lbs (the water that is displaced). In the past, a famous person named Archimedes’ Principle discovered that the buoyant force is equal to the weight of water an object displaces.

Hajime 🙂

### 2 thoughts on “Buoyancy”

• December 8, 2016 at 9:53 am