pressure measuring devices

2. Group #02
FAWAD MEHMOOD 02
FAHAD RASHID 06
SHAHBAZ KHAN 21
WASIF ALI 22
JAWAD AHMAD 25

3. SHAHBAZ KHAN 21
WHAT IS BUOYANCY?
WHAT ARE THE TYPES OF BUOYANCY?
STABILITY OF FLOATING AND SUBMERGED BODIES.

4. BUOYANCY:
 Buoyancy or upthrust, is an upward force exerted by
a fluid that opposes the weight of an immersed object.
 This upward force is equal to the weight of the body
immersed.

5. Buoyancy is caused by
differences in pressure acting on
opposite sides of an object
immersed in a static fluid.
Objects immersed in a fluid
have an apparent weight that is
reduced by the buoyant force
(less than their actual weight)
i.e. W`=W - B

6. TYPES OF BUOYANCY:
THERE ARE THREE TYPES OF BUOYANCY:
1. POSITIVE BUOYANCY:
POSITIVE BUOYANCY OCCURS WHEN AN OBJECT IS LIGHTER THAN THE FLUID IT
DISPLACES.
• THE OBJECT WILL FLOAT BECAUSE THE BUOYANT FORCE IS GREATER THAN THE
OBJECT’S WEIGHT.
2. NEGATIVE BUOYANCY:
NEGATIVE BUOYANCY OCCURS WHEN AN OBJECT IS DENSER THAN THE FLUID
IT DISPLACES. THE OBJECT WILL SINK BECAUSE ITS WEIGHT IS GREATER THAN THE
BUOYANT FORCE.

7. 3. NEUTRAL BUOYANCY:
Neutral buoyancy occurs
when an object’s weight is equal to
the fluid it displaces.

8. Center of Buoyancy:
 The point in a body through which the force of buoyancy is
supposed to act is called center of buoyancy.

9. Floating Bodies:
Things/Bodies float in a fluid when:
 The body is less dense than the fluid they are in.
 The body weight is less so that the buoyancy force push it
up.
 The shape of the objects is such like the weight is spread
out over the whole body.

10. Submerged Bodies:
Bodies get submerged in a fluid when:
 The bodies are more dense than the fluid they are in.
 The weight of the body is more so that gravity effect is high which
overcome the buoyancy force of the fluid.

11. Stability analysis of submerged bodies:
 if the center of gravity of the body lies below the center of buoyancy then
body is stable equilibrium.
 An overturning couple leading to unstable equilibrium results if the
center of gravity is above the center of buoyancy.

12. Stability Analysis of floating bodies:
Stability analysis can be explained as:
 Stable bodies:
When center of buoyancy(M) is above Center of gravity(G).
 Unstable Bodies:
When Center of buoyancy(M) is Below Center of Gravity(G).
 Neutral Bodies:
When the center of buoyancy(M) is at the center of gravity(G).