"Left: All the water in the world (1.4087 billion cubic km3 of it) including sea water, ice, lakes, rivers, ground water, clouds, etc. Right: All the air in the atmosphere (5140 trillion tonnes of it) gathered into a ball at sea-level density. Shown on the same scale as the Earth."
I don't know anything more than is on the site, but several commenters show their math.
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