The air alone is not able to blow up a balloon. When air in the bottle is heated with a balloon on top of it, the air expands due to the heat and moves and finds more space. This in turn will blow up the balloon.
The hot water heats up the air inside the bottle, causing it to expand, forcing some of the air out of the bottle and into the balloon, causing it to inflate. The larger the bottle, the more air that will be pushed into the balloon. The air in the balloon will quickly cool and, since hot air is less dense and therefore rises, the cooler air is forced back into the bottle to be heated up. Eventually the air will be a constant temperature and the balloon will reach the limit of inflation. As the water cools, the air cools and the balloon begins to deflate.
When a bottle-and-balloon system is placed in hot water, the air inside the bottle expands due to an increase in temperature. Since the bottle is sealed off from the outside, the expanding air has nowhere to go, causing the balloon to inflate as a result of the increased pressure inside the bottle.
The air in the balloon will have a difficult time expanding to fill the bottle because the bottle is already filled with air at atmospheric pressure, which creates resistance. The pressure inside the balloon needs to overcome the pressure inside the bottle in order for the balloon to expand and fill the bottle.
Air inside the bottle expands when the bottle is heated. Some of it leaves the bottle until the pressure of the heated air remaining in the bottle equals the pressure of the air in the room. The balloon is then placed over the neck of the bottle and prevents any more air from entering or leaving the bottle. The air inside the bottle cools to the temperature of the ice water. The cooler air inside the bottle takes less space (volume) than it did when hot, so it sucks the balloon inside the neck of the bottle. Air pressure inside the bottle causes the balloon to stretch and enlarge until the air pressure inside the bottle, including the air in the balloon, has the same pressure as the air in the room.
Yes, if the air pressure in the bottle is higher than the pressure you are exerting to blow up the balloon, it can make it difficult or impossible to blow up the balloon inside the bottle. The higher air pressure in the bottle will resist the expansion of the balloon.
A hot air balloon lifts off the ground by heating the air inside the balloon using a propane burner. As the air inside the balloon heats up, it becomes less dense and expands, creating lift. The hot air inside the balloon is lighter than the cooler air outside, causing the balloon to rise.
because heat expands things... and the heat expands the air in the bottle and the air in the balloon... the only place for the air to go, since it cannot expand the bottle... is out into the balloon, increasing the pressure there and inflating the balloon. :-)
No, but you can build a snowman. Yes, you can inflate a balloon in a bottle, although it is more difficult than inflating a balloon that is not in a bottle. The only problem that this presents is that it is possible for the balloon to block the opening of the bottle so that air will be trapped between the balloon and the bottle, which would prevent the inflation of the balloon. However, if you use a drinking straw you can create an avenue for air to escape.
A hot air balloon is powered by burning propane in the burner, which heats the air inside the balloon envelope. As the air inside the balloon heats up, it becomes less dense than the surrounding air, causing the balloon to rise. The pilot can control the altitude by adjusting the burner intensity to heat the air more or less.
conduction
The flame heats the air contained in the balloon. This causes the air to expand, thus it becomes less dense than the air surrounding the balloon. Once the air in the balloon is sufficiently less dense than the surrounding air to overcome the weight of the balloons materials, it will lift into the air.
Because air takes up space. When you attempt to blow up the balloon, you are adding air to the inside of it. But the air between the balloon and the bottle has no place to go. It will only contract so much.