why birds cannot fly in vacuum?

Answer 1

For two reasons,

1) In vacuum, they don't have air to breathe, so they die.

2) Again there's no air in vacuum, so they can't fly. Birds fly because there's air. When a bird flies, the air flow on top of the wing is faster than that under the wing. So the air pressure on top of the wing is lower than that under the wing. This creates a lifting effort, so the bird can fly. Airplanes are based on the same concept. That's why the top of the airplane wings are not flat, but curved.

Answer 2

Air is a fluid, just like water, just in a different phase (gaseous phase). Air can be liquified and solidified under the right pressure and temperature conditions. Anyway, because it's a fluid, things that move around in air experience friction. Friction is an opposing force to a motion in some direction. So when the bird's wings are on the down cycle, the frictional force is upward, which cause the bird to fly. This is also called "lift", while frictional forces are called "drag". Lift and drag are in connstant opposition to one another, which is why the bird has to flap it's wings so fast and so consistently to develop a speed to fly, at which point he can cruise in the fluidic air (glide, soar) without having to flap anymore for a while, just like one would glide through the water in a swimming pool or lake after swimming several strokes.

Since there is no air in vacuum environments, there can be no lift from friction, and there can be no flight.

Hobbyist pretends to know what he's talking about, but he's only scratching the surface of the physics that transpires during flight. Actually, birds can fly on the moon, it would just take more work and a faster rate of wing motion. The moon is not in a vacuum, dumbass.

Answer 3

Many science courses still do not explain well enough why birds can fly in the air before even considering a vacuum!!!! The answer to both these questions is that air is a substance and has mass. According to Newton's Law forces can be generated from accelerating masses and so bird wings (and airplane wings and wind generator blades) obtain their ability to create what is known as "lift" by "tossing air around". Air has a mass density almost exactly equal to two pounds per cubic yard or 1.2 kilograms per cubic meter, certainly sufficient for the support of the weights of the bodies of birds when accelerated by their wings. On the moon, with no atmosphere, birds cannot fly and only rocket propulsion is capable of generating flight.

Note: the usual answers about wings creating lift by being curved on top in order to accelerate the air there are only partially true and should not be allowed to be considered among the "best" answers!!! This old concept needs to die and be forgotten and be replaced by the correct and more complete one of simple mass airflow deflection and downward acceleration as described using vector algebra.

Answer 4

Animal experiments show that rapid complete recovery is the norm for exposures of less than 90 seconds, while longer full body exposures are fatal and resuscitation has never succeeded. There are limited data available from human accidents, but they are consistent with animal data. Limbs may be exposed for much longer if breathing is not impaired. Rapid decompression can be much more dangerous than the vacuum exposure. If the victim holds his breath during decompression, the delicate internal structures of the lungs can be ruptured, causing death. Eardrums may be ruptured by rapid decompression, soft tissues may bruise and seep blood, and the stress of surprise will accelerate oxygen consumption leading to asphyxiation.

Answer 5

Two reasons:
1. Birds need oxygen to breathe, otherwise they die
2. Birds need air to lift them up when they flap their wings

Answer 6

because in a vacuum birds cannot breath, so they die, dead birds dont fly !

Answer 7

if they could live in vaccum (keep their organs running) they could fly, kinda of like how a rocket can accelerate in space. they exerte a force in one direction (on..er...nothing but its the force that matters) and the equal and opposite reaction force pushes them in the other direction (upwards) (would).... but they can't glide in vaccum since there's no matter...gliding is due to air resistance of wings...

Answer 8

their wings ride on air!

Answer 9

in vaccum they cant build nest

Answer 10

First they should be alive..