Question

Why is it that gas in a balloon filled with helium rises in air
Answered by GPT 3.5
Gas in a balloon filled with helium rises in air because helium is lighter than the surrounding air. Helium is a less dense gas than the nitrogen and oxygen that make up the majority of the air we breathe. This difference in density causes the helium-filled balloon to float upwards, as it is buoyant in the heavier air. This principle is known as buoyancy, where less dense objects will float in denser fluids.