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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If you want to visualize 10^14: If a water molucule is a cubic mm (pinhead), a cell's worth would be 10^5 × 10^5 × 10^4, or: 100m × 100m × 10m —an entire city block's worth of three-storey buildings.
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Picking a smaller scale: model a water molecule as 1/10 of a mm, about as small a thing as you can see; now 10^14 would take up: 100m^3, or 6m × 6m × 2.75m — about the size of a living room.
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