Very roughly how many water molecules would you guess there are in a single cell? Within a couple of orders of magnitude? I got it quite wrong.
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10^11 neurons in brain, suggests about 10^13 cells in body (though maybe more if some v. small). About 10^26 or 10^27 water molecules in body (mostly what we are!). So about 10^13 or 10^14?
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If I am allowed to rely on a calculation I did years ago about how many molecules of water are there in a glass (thus getting a "volume" per molecule), I get the same numbers by assuming 100% of cell content being water.
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I think on the order of 10^12, a cell mass has a lower water to other stuff ratio than our body as a whole. Of course, we're just casting variation in cell sizes to the wind here, but thats the fun part
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