hydrogen gas has less density cmpared to other gases.as we know that objects with less density floats in water similarly hydrogen gasfloats in the air
Dhruv Bindra answered this
Because it's weight is very less and it can float in air
Shivangi Bhardwaj answered this
Balloon filled with hydrogen gas floats in air because its density and weight is less than that of air.
Vanshika Chaudhary answered this
When balloon is filled with hydrogen gas its density becomes less than that of atmospheric air so its weight becomes less and buoyant force of air increases and it starts floating.This explains floating of balloon in air. Hope it helps.........
Ratish Sharma answered this
Hydrogen gas is very light in weight and has very low density that's why it floats easily in air.