BAROMETER

BUOYANCY AND STABILITY

HYDROSTATIC FORCES

MANOMETER

PRESSURE AT DEPTH

The weight loss an object in sea water.

    

Buoyant force

What is buoyancy force?

The behavior of an object submerged in a fluid is governed by Archimedes’ Principle. Archimedes is determined that a body which is completely or partially submerged in a fluid experiences an upward force called the Buoyant Force, B ,which is equal in magnitude to the weight of the fluid displaced by the object. This principle can be used to explain why ships, loaded with millions of kilograms of cargo, are able to float.

To prove Archimedes’ Principle, consider an object immersed in a fluid, as shown in the Figure 1.

Figure 1: Buoyant Force

Archimedes’ principle:

The different condition for a body immersed in a fluid in Figure 2.

Figure 2 : condition for a body immersed

 

1. Rises to the surface of the fluid and float

Density < density of fluid

The body will float if the buoyancy is positive (body weight < weight of displaced liquid)

1. Suspended body when

Density = density of fluid

The body will be suspended if the bouncy is neutrally buoyant (body weight = weight of displaced liquid).

• Remains at rest ( sink to bottom )at any point in the fluid when

Density > density of fluid

The body will sink if the buoyancy is negative (body >weight larger than weight of displaced liquid)

Floating bodies

Is the weight of the entire body must be equal to the buoyant force, which is the weight of the fluid whose volume is equal to the volume of submerged portion of the floating body. That is , of unform density W_s also acts through the centroid, but its