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Air has weight wherever it is. The weight of a jug full of air depends on the temperature
and pressure in the jug.
At sea-level pressure and 32 degrees, one pound of air fills about 92.7 gallons, and the
air in a 10-ft x 12-ft bedroom with a 7-ft ceiling represents about 67.8 pounds of weight.
Don't forget, though, that anything surrounded by fluid is buoyed up by a force
equal to the weight of the displaced fluid, and a room full of air displaces ... one
roomfull of air! So it 'floats', and winds up with a net weight of essentially zero.
(If you could suddenly heat all the air in the room, making it less dense than
the air around it, then the buoyant force would be more than its weight, and
it would want to rise. Then the room would be a "hot-air balloon".)
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∙ 13y ago
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How does a hot-air balloon rise?
The upthrust on the balloon is greater than the weight of the balloon. Thus, it rises upwards. The upthrust on the balloon is greater than the weight of the balloon because the air inside it has a lower density than the surrounding air.
How does a hot air balloon float even though it is so heavy?
Well the basic answer is that when the balloon is 'floating' it is not heavy. The hot air inside the balloon is less dense and therefore lighter than the ambient air. The hotter it is, the lighter it is. When the weight loss of the air inside the balloon is equivalent to the weight of the balloon and equipment, passengers, etc., then it will float. The weight reduction of heated air is quite small which is why balloons have to be so big.
How much weight can a hot air balloon hold?
It depends on the size and how hot the air inside is
Why does a balloon containing hot air rise while one containing cold air falls?
Because hot air is less dense (ie lighter) than cooler air, it rises. If the total weight of the balloon,( including the warmer air inside it) weighs less than the exact volume of the cooler air which it displaces, it will 'float' upwards. When the air inside cools to a point where the total weight of the balloon equals the weight of the volume of air it displaces, it will cease to rise.... it will 'hover'. If the hot air further cools to where the total balloon weight is greater than that of the displaced air, the balloon will descend.
Is an air inside a balloon a pure substance?
The air inside a hot air balloon is the same as normal air around the balloon and the air you're breathing, only heated by the flame inside the balloon, hence HOT AIR balloon.
When you heat the air inside a hot air balloon, it rises. Why does this occur?
D: The hot air inside the balloon becomes less dense than the air outside the balloon.
How does the kinetic energy of air inside a balloon to outside air?
the air inside the balloon has more kinetic energy
Does a hot air balloon have helium inside it?
No, I am sorry, but there is no helium inside a hot-air balloon. Instead, there is hot air.
When you heat the air inside a hot air balloon it rises. Why does this occur?
D: The hot air inside the balloon becomes less dense than the air outside the balloon.
Does gravity go inside of a balloon?
No. Air or helium goes inside the balloon.
What air force makes a air balloon go up and down?
This is the buoyancy force. Archimedes is credited with first formulating this into a mathematical principle: the buoyancy force of an object is equal to the weight of fluid it displaces. In the case of a hot air balloon, the "fluid" is the outside cool air and the balloon is displacing a volume of cool air equal to the volume of the inflated balloon. So you can say the buoyancy force F = V ρ g, where V is the volume of the inflated ballon, ρ is the outside air density, and g is gravity. A balloon can float because it is displacing this cool air with hot air which is less dense. The volume of hot air inside the balloon thus weighs less than the same volume of cold air outside the balloon. For a balloon to be float upwards, the buoyancy force has to be at least equal to the weight of the balloon (the balloon fabric, the gondola, the people, equipment and cargo, and the hot air inside). For example, for a balloon of 100,000 cubic foot volume (typical), with outside air at 20 deg C near sea level, the buoyancy force is about 7500 lbs. This force has to lift the gondola, people, equipment and of course the hot air inside the balloon, all of which have weight. By far the greatest percentage of that total weight is the heated air inside since there is so much of it.
What if a balloon is heated what happens to the volume of the air in the balloon if the pressure is constant?
For a balloon that is sealed and not full the volume of air inside the balloon will increase as it is heated. This is not however how hot air balloons work. A hot air balloon is essentially a fixed volume when it is inflated. If the air inside the balloon is heated the air inside becomes less dense so some of the air exits the balloon via the mouth of the balloon. As the air inside the balloon cools it becomes more dense so some air is ingested via the mouth of the balloon to keep it full. With each heating and cooling cycle, the pressure inside the balloon remains constant, the volume of the balloon remains constant but there is this movement of air out of and back into the balloon. P=VT Poop
