I don't have this game for the ds but for the wii. On my version, there is no such thing. Hot air balloons have nothing to do with it. Maybe a way of transportation? Finish some goals. I advise you to finish as many goals as you can until you unlock it.
air is heavier than balloon, air rises
to make a hot air balloon rise you use hot air
The volume of air increases on its heating hence the balloon rises on heating
-- Inflate the balloon with some substance that is less dense than air. OR -- Inflate the balloon with air, then heat it after it is sealed.
Simple...hot air rises..
Hot air is less dense compared to cold air. The heated air in the balloon will rise, making the balloon float in the air.to make it rise.
Hot air goes into the balloon. sense the air is so hot, it pushes the balloon off the ground and floats in the air!
A hot air balloon is called an hot air balloon because, the inside is heated up to make it less dense, allowing it to rise. Meaning, your heating up the air inside the balloon, hence, the name: Hot air balloon.
Helium is lighter than air. So helium balloon rises in air.
Hot air rises. By heating the cool air in the balloon using a propane heater, heats the air and makes the balloon rise
He would heat it.
Fill a balloon part way with helium, make an animal out of it and have it float.