If you mean a kid's balloon, nothing.
If you mean a hot air balloon, then it slowly cools and thus gets denser (heavier).
Therefore it needs to be re-heated periodically.
You can not cut the air balloon down.
a hot airballon heats up the air inside of it which makes it less dense then the colder air around it causing it to have lift but the only movement that they can really control is up and down the rest depends on the air currents
Once the air cools, the balloon will lose its lift and settle back to the ground.
Luftballon is the German word for balloon.luft = airballon = balloon..so luftballon jsut means air-balloon. A luftballon is more specifically a "toy" balloon as opposed to a hot-air balloon or balloon for some other purpose.
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.
Pressure. You are describing a blow-up balloon, not a hot-air balloon. In a blow-up balloon, you put a lot of air in it and it is under pressure. It is under more pressure than the air around it. That means the air inside is pushing to get out. Actually, to be technical, the air on both sides is happy to go to the other side, if possible, but the pressure causes more air to leave than comes in. Once the air starts to leave, the pressure goes down and the balloon deflates. Once the pressure is the same inside and out, it will look flat.
Once the air pressure inside the balloon is greater than the air pressure outside the surface it starts to fill. the higher the pressure inside the more the air acts against the inner rubber surface and the balloon gets harder. an empty balloon has the same air pressure inside and outside. Once you push any air in therefore you are starting to raise the air pressure inside.air molocules from you fill it up
The hot air from the gas burner rises and enters the balloon's envelope. Once there is enough hot air trapped, the whole balloon will begin to lift off the floor. This is due entirely to the fact that hot air rises.
The burners on a hot air balloon create hot air, which rises into the balloon and displaces the cooler air from the balloon. Then the hot air, being less dense, will lift the balloon as the cooler surrounding air sinks below it. Once the air cools, the balloon will lose its lift and settle back to the ground. The hot air is only slightly less dense, so it requires a lot of volume to lift the comparatively smaller mass of the balloon and gondola.
Once the balloon gets high enough in the atmosphere, the ambient atmospheric pressure becomes very low (say 20mb = 2000Pa). There is a pressure gradient force from the high pressure of the air inside the balloon to the air in the environment outside of the balloon, working across the balloon material. Once this PGF becomes stronger than the tension of the balloon material, the balloon will pop.
If there is warm air in the balloon, cooler air makes the balloon rise and if there is cold air in the balloon warmer air makes the balloon fall.
you spend it on a air balloon once you get past the gate