The pilot blacks out and dies, then comes back as a zombie
air is heavier than balloon, air rises
Hot air rises. As the air in the hot air balloon is made hotter than the surrounding air it rises.
As the air in the balloon is heated from the flames, the air becomes lighter. So much lighter than the surrounding air that the balloon eventually rises from the light air in it.
It has less weight holding it down, so it goes higher.
The volume of air increases on its heating hence the balloon rises on heating
The volume of the balloon will increase as it rises in the air. This is because the atmospheric pressure decreases at higher altitudes.
it rises
It rises until the air it displaces weighs no more than the balloon and everything hanging from it weighs.
Air inside the balloon is heated. Hot air is less dense than the surrounding air, and thus the balloon rises.
air is heavier than balloon, air rises
Baloon filled with hydrogen gas float in air or rises if the quntity of gas it contain is adjusted so that the average density of the balloon is just eguall to the density of the surrounding air.The weight of the displaces air is then eguall to the weight of the balloon
air is heavier than balloon, air rises
Hot air rises. As the air in the hot air balloon is made hotter than the surrounding air it rises.
As the air in the balloon is heated from the flames, the air becomes lighter. So much lighter than the surrounding air that the balloon eventually rises from the light air in it.
It has less weight holding it down, so it goes higher.
The density is reduced to 50% (half) of its original value.
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.