# Buoyant force of air negligible?

In summary, the buoyant force of air is the upward force exerted by air on an object, due to a difference in pressure between the top and bottom of the object. It is considered negligible because air is less dense than liquids, but can have a significant effect on light or large objects. The buoyant force affects objects differently based on their shape, size, and density, and can be used to provide lift for airplanes through differences in air pressure.
Buoyant force of air negligible??

Why are we justified in assuming that the buoyant force on an object in air is generally negligible. Can you please explain using some example equations?

Many thanks.

Last edited:

Depends on the weight of the object and how accurate you need to be. Why not calculate the buoyant force on something and compare it to that something's weight.

## 1. What is the buoyant force of air?

The buoyant force of air is the upward force exerted by the air on an object placed in it. This force is a result of the difference in pressure between the top and bottom of the object.

## 2. Why is the buoyant force of air considered negligible?

The buoyant force of air is considered negligible because air is much less dense than liquids, such as water, and therefore exerts a much smaller upward force on objects placed in it.

## 3. Can the buoyant force of air be ignored in all situations?

No, the buoyant force of air can have a significant effect on objects that are very light or have a large surface area, such as a balloon or a parachute. In these cases, the buoyant force of air must be taken into account.

## 4. Does the buoyant force of air affect all objects in the same way?

No, the buoyant force of air affects objects differently depending on their shape, size, and density. Objects that are more dense than air will experience a downward force, while objects that are less dense will experience an upward force.

## 5. How does the buoyant force of air affect the flight of an airplane?

The buoyant force of air affects the flight of an airplane by providing lift. The shape and angle of the airplane's wings create a difference in air pressure, which results in an upward force that allows the airplane to stay in the air.

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