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Hydrogen gas, H2, is less dense than air, and so it rises. By keeping the mouth downwards, the hydrogen will remain in the test tube.
The density of a gas is directly proportional to its molecular weight (see the Related Question about the density of oxygen and air to the left for why this is), and H2 gas is much lighter than air. The average molecular weight of the molecules in air is 28.97 grams per mole, but the molecular weight of hydrogen gas is only 2.01 grams per mole. Hydrogen gas is more than 14 times less dense than air!
Wiki User
∙ 16y ago
Wiki User
∙ 16y agoHydrogen is less dense than air. If any gas where to leak from the bottle, it would leak from the top, not the bottom.
An example to illustrate this is to imagine putting an empty cup upside down in water. The air in the cup is less dense, so it tries to move upwards. As long as you keep the opening of the cup pointed downwards the air will, more or less, stay put.
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