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When you release a balloon that is filled with air, the density of the balloon is higher than the air surrounding it. As a result, gravity pulls the balloon down towards the floor. The buoyant force acting on the balloon is not strong enough to overcome the force of gravity, causing the balloon to fall instead of float.

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AnswerBot

1y ago

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Why do islands float?

Islands do not float. Islands are the result of mounains or hills that go above thse surface of the water, which sit on the ocean floor.


Does the floor exert an upward force against your feet?

Yes, the floor exerts an upward force on your feet in response to the gravitational force pulling you down. This force is known as the normal force and it helps to support your weight and keep you from falling through the floor.


What force keeps a hot air balloon in the air?

It has nothing to due with "convection" or any other motion of the air. (If it did, then how would you explain floating helium balloons, which are at the same temperature as the air?) The pressure of the air around you (even perfectly still air) decreases with altitude. It's well known, for example, that the air pressure at the top of a mountain is much less than at the mountain's base--that's why you need breathing equipment up there. The difference is caused by the weight of the air itself--lower locations have a greater mass of air weighing down on them than higher locations, and that produces pressure. Even within a room, there's a SLIGHT difference in air pressure between the floor and the ceiling. The air pressure at the floor is slightly greater. That difference produces a small upward force called "buoyancy" on EVERY object in the room, including you. Air pressure pushes on you from all directions; but the pressure on your feet (pushing up) is slightly greater than the pressure on your head (pushing down). This isn't enough to make you float, but it is enough to reduce your measured weight by a small amount. The amount of buoyancy acting on an object depends on an object's VOLUME. For a typical adult human (in typical air), the buoyant force on their body is around 3 ounces. That means the number you see on the bathroom scale is about 3 ounces less than your "real" weight. It also means that if your "real" weight (due to gravity's pull) were less than 3 ounces, the buoyant force would overcome gravity, and you would float away! So the trick to floating is to reduce your weight (your mass), while increasing your volume (to increase the buoyant force). Both of those actions decrease your density. It turns out that if you decrease your density to the point that you're less dense than the air around you, the buoyant force will exceed the gravitational pull, and you'll float. So that's what hot air balloons do. Hot air is less dense (has fewer molecules per cubic meter) than cold air, so that reduces the balloon's weight. But because those molecules are moving fast, they have enough pressure to expand the balloon, increasing its volume (and hence increasing the buoyant force). When the buoyant force exceeds the weight, the balloon rises.


Why do some tectonic plates sink while others float?

They all float (on the mantle), some just float lower than others. The main reason is what they're made of; all plates have a high percentage of silica in them, but those with more aluminium than magnesium (continental plates) float higher than those with more magnesium (ocean floor plates) because they're less dense.


What forces are acting on a balloon tied with string to the ground?

If you need a one word answer, then I think "buoyancy" is what you're looking for. Buoyancy is caused by falling air pressure with altitude. Air pressure at sea level is over 14.7 pounds per square inch (2000 pounds per square foot!). You can feel this pressure by pulling on a suction cup. Because air pressure drops with altitude, the force from air on the top of an object is less than on the bottom. If the object has very low density (such as a helium-filled balloon), this difference in force is enough to push the object up.

Related Questions

Why is a hellium balloon on the ceiling one day and on the floor the next?

A helium balloon rises to the ceiling because helium is lighter than air, allowing the balloon to float. Over time, helium slowly escapes through the balloon's material, causing it to lose buoyancy. Once the balloon's helium level decreases enough, it can no longer stay afloat and descends to the floor. Temperature changes and air pressure can also affect the balloon's behavior, contributing to its descent.


A balloon filled with air is released in a room filled with carbon dioxide will the balloon float to the ceiling or sink to the floor?

The balloon filled with air will float to the ceiling in a room filled with carbon dioxide. This is because the density of carbon dioxide is greater than the density of air. The balloon will experience a buoyant force upwards due to the density difference, causing it to rise towards the ceiling.


What happens when a balloon filled with water is pricked with a pin?

The balloon pops and the water falls out and splashes onto the floor.


Can return air vents be put in the floor instead of the wall of a house?

Yes vents can be in the floor instead of the wall.


What is the balloons initial velocity when a water balloon is dropped from the fifth floor of a building?

If you simply release an object, the initial velocity is always zero.


Why doesn't gravity act upon a bowling ball being rolled in a bowling alley?

It does act upon it. If gravity weren't acting upon the ball, it would float into the air instead of remaining on the alley floor.


What happened if you prick the balloons?

The balloon pops and the water falls out and splashes onto the floor.


Is there another way of popping the trunk instead of using the key on a Dodge Neon?

Some Neons have a trunk release lever on the floor by the door.


Why does a balloon filled with oxygen air fall to the floor when released?

because it doesn't have any oxygen in it.


Why does the cat choose to sleep on the floor instead of the bed?

The cat may choose to sleep on the floor instead of the bed because it finds the floor more comfortable, cooler, or simply prefers that spot for sleeping.


What muscles are used in abdominal balloon mechanism?

Diaphragm, Pelvic Floor, Internal Obliques and Transversus Abdominus


Is it better to glue down or float an engineered floor?

engineered floors such as pergo or Armstrong should float on a supplied pad because the will expand and contract with weather conditions