Balloons fly using the principle of cold and hot air plus gravity. Hot air rises and cold air descends. The balloon is pumped with air which is then heated, making it rise. When the air inside the balloon cools, the balloon will descend.
Balloons fly using the principle of cold and hot air plus gravity. Hot air rises and cold air descends. The balloon is pumped with air which is then heated, making it rise. When the air inside the balloon cools, the balloon will descend.