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Question

Water vapour is lighter than air so it can be _______________.

Solution
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less dense.

At 18 atomic units, water vapor is lighter than diatomic Oxygen (32 units) and diatomic Nitrogen (28 units). Thus at a constant temperature, the more water vapor that displaces the other gases, the less dense air will become. As the moist air is less dense than dry air, it rises up.

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