The wetted perimeter can be defined mathematically as
$$P=\sum_{i=0}^{\infty} l_i$$
what is this means that $l_i$ is the length of each surface in contact with the aqueous body?
the length of each surface of what is in contact with aqueous body?
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1$\begingroup$ Can you expand on your question a bit? What sort of systems are you talking about and where did the equation you mention come from? $\endgroup$– John RennieJun 23, 2014 at 6:58
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$\begingroup$ Someone added a link to Wikipedia in your question. Can you explain what about that page is unclear to you? $\endgroup$– BernhardJun 23, 2014 at 10:42
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