Buoyancy Totally Explained

In physics, buoyancy is the upward force on an object produced by the surrounding fluid (for example, a liquid or a gas) in which it's fully, or partially immersed, due to the pressure difference of the fluid between the top and bottom of the object. The net upward buoyancy force is equal to the magnitude of the weight of fluid displaced by the body. This force enables the object to float or at least to seem lighter. Buoyancy is important for many vehicles such as boats, ships, balloons, and airships.
Buoyancy acts against the force of gravity and so makes objects seem lighter with respect to gravity. To represent this effect, which is important for sedimentation, it's common to define a buoyant mass m_b that represents the effective mass of the object with respect to gravity ť $m_$

Density

If the weight of an object is less than the weight of the fluid the object would displace if it were fully submerged, then the object has an average density less than the fluid and has a buoyancy greater than its weight. If the fluid has a surface, such as water in a lake or the sea, the object will float at a level so it displaces the same weight of fluid as the weight of the object. If the object is immersed in the fluid, such as a submerged submarine or a balloon in the air, it'll tend to rise. If the object has exactly the same density as the liquid, then its buoyancy equals its weight. It will tend neither to sink nor float. An object with a higher average density than the fluid has less buoyancy than weight and it'll sink. A ship floats because although it's made of steel, which is more dense than water, it encloses a volume of air and the resulting shape has an average density less than that of the water.

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