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The way to make sense of this is not to think about the water weight but the solid matter. By changing the proportion of water from 99% to 98%, you're also doubling the proportion of solid mass from 1% to 2%.


> you're also doubling the proportion of solid mass from 1% to 2%.

And the final step is then, that the solid mass didn't change and therefore the liquid must be halved, instead of the solid doubled.




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