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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A water molecule is roughly 3Å (I remembered this!). An Å is 10^-10m (I remembered this too!) How big is a cell? (I didn’t remember this, if I ever knew!) 10μ is too small and 100μ is too big (although for a Fermi estimate, but might be reasonable).
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I went for 100μm, from vague memories of onion cells in school biology class. But probably we were using onion cells because they were unusually big.
