so for surface integral for scalar quantities. Why do we use cross product not dot product in the integral? but can we just add an unit normal vector(adsbygoogle = window.adsbygoogle || []).push({}); nto make the direction the same? My question seems really stupid too a lot people, but this is really my confusion to surface integral. please give me a simple but sensible answer. Thank you!

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# Surface integral for scalar quantities

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