Nope? A gram of water is mostly oxygen. Hydrogen is just 2/18 of the water mass,... | Hacker News

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cyberax 10 months ago | parent | context | favorite | on: Eliminating contrails from flying could be cheap

Nope? A gram of water is mostly oxygen. Hydrogen is just 2/18 of the water mass, so that's where the factor of 9 comes from.

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