Hydrogen balloons will rise into the air. What will happen to the volume of the hydrogen balloon during its ascent?

Because with the increase of height, the air pressure will decrease, while the air pressure in the hydrogen balloon is constant. When the hydrogen balloon is launched, the external air pressure will decrease, and the gas in the hydrogen balloon will be pressed outward, so the volume will increase. When it rises to a certain height, the hydrogen balloon will burst because of its excessive size.

Hot air balloon should cloud in ancient China, ancestors' lanterns (also called sky lanterns, flying lanterns, sun lanterns, empty lanterns, etc. ) heats the air in the lantern, which makes the air temperature in the lantern rise. The expansion of local discharge makes the air density, total mass and total gravity in the lamp decrease. When buoyancy is greater than total gravity, lanterns can take off. The same is true of the hot air balloon invented in the west later. In order to make a hot air balloon ascend or fly in the air, it must be heated continuously and stopped. When the temperature of the air inside the balloon drops and its volume shrinks, the cold air outside will enter and the total gravity will increase. Once the total gravity is greater than buoyancy, the hot air balloon will fall.

Later, the balloon was filled with less dense hydrogen. When the buoyancy is greater than the gravity of the balloon, the balloon will rise. When it rises to a certain height, buoyancy equals gravity, so it can float in the air; By releasing part of the gas, the volume of the balloon is reduced and the buoyancy is also reduced. When buoyancy is less than gravity, the balloon can descend.

Balloons should be released during festivals, because buoyancy is greater than gravity. However, in the process of rising, due to the decrease of atmospheric pressure, the volume of the balloon will increase, although the density of air will also decrease, but considering comprehensively, the buoyancy will increase, so the balloon will continue to accelerate until it bursts.

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