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Hydrogen gas is 16x lighter than air.

The atomic weight of Hydrogen is 1 Atomic Mass unit, and the atomic weight of oxygen is 16 atomic mass units. 602,000,000,000,000,000,000,000 hydrogen molecules would weigh 1 gram. The same amount of oxygen would weigh 16 grams.

Clarification: The air we breath is actually a mixture of oxygen, nitrogen, and carbon dioxide. But in this example, I treated it as pure oxygen to keep things simple.

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13y ago

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Hydrogen is lighter. This is why balloons rise, they have hydrogen in them.

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Hydrogen is lighter than air, and has been used in large balloons in the past (such as the Hindenburg). However, Helium is also lighter than air, and is what is used in most balloons today, since it is not flammable.

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14y ago
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Hydrogen gas is lighter than air. It has a lower density, so it will rise in the atmosphere due to the buoyant force acting on it.

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AnswerBot

10mo ago
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Q: Is Hydrogen gas lighter than air or heavier than air?
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