This knowledge may very well be pre-historic - however Thalos is quoted as having mentioned it. There are no direct works of Thalos preserved, he was the great grand-daddy of philosophy and lives on only in quotes of his successors.
hot air rises
Hot air rises and cold air falls.
A hot air balloon rises because the air inside the envelope is heated by a burner, which makes it less dense than the surrounding cooler air. This lower density causes the balloon to float upwards, much like a cork in water.
Hot air rises because it is less dense than cold air. As hot air heats up, its molecules become less tightly packed and therefore lighter than the surrounding cold air, causing it to rise. This process is known as convection.
A hot air balloon rises because when hot air is added it is intended to rise and when the hot air balloons wants to land, hot air is decreased.
hot air rises
hot
hot air rises
Hot air rises. That is how a hot air balloon works.
Hot air is lighter than cold air, so it rises up. Ex. A hot air balloon rises up because we heat the air and it goes up.
Hot air rises and cold air falls.
hot air rises up
Convection
Hot air rises because it is less dense than cold air.
"Warm air", otherwise known as Hot Air Balloons, float because of one basic Law of Thermodynamics; heat rises. The air in a hot air balloon is hot, therefore, the balloon rises.
The air density inside a balloon changes as it rises because the hot air inside the hot air balloon is less dense than the air around it causing it to fly since hot air rises. But as it rises it loses its hot air causing it to eventually not be able to fly anymore and come down.
it forms a tornadow