Question

Why does a balloon filled with hydrogen gas rise up against gravity

Answer 1

Because Hydrogen is lightest gas in our Earth!!!! And

Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.[note 1] Non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed protium (name rarely used, symbol 1H), has one proton and no neutrons.

Answer 2

  Ans:-A balloon full of hydrogen or helium does not defy gravity. ... On Earth the balloon floats on the denser lower atmosphere, because it is less dense than air. It rises until the mass of the balloon equals the mass of the air it displaces.

   Ans:- As the weight of the balloon is less than the weight of air displaced by it therefore the balloon rises in air. In balloons hydrogen is normally filled because it is lighter than air.

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