Stone steps erode with every footstep, leading to indents over time, right? But other things seem to erode on their own through time alone, so what causes that? Wind and rain? Would it therefore be correct to say that anything, if subjected to constantly running water, loses a few atoms every second and would eventually erode? Would this mean nothing is technically 100% waterproof? Or can things erode on their own without an external force? Thanks!
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I don’t think you’ve got your scales right with “loses a few atoms”. A penny weighs 2.5g, and is 97.5% zinc. That’s 0.2303×10^23 zinc atoms. Losing 23 atoms is 0.000000000000000000001%, unless I lost count with the 19 zeros. That’s 100% watertight, unless you’re in some weird scientific 24 significant digit problem.
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