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I am slightly confused about the actual meaning of dx. Because I read in a physics textbook, they say something along this line:

"We divide this region into spherical shells of radius r, surface area 4pr 2, thickness dr, and volume dV = 4pr^2 dr."

I don't understand how can we represent dV like this, like it's a small bit of the total V. However, we learnt in mathematics dx represent a small "change" in x. I am not sure whether I should treat dx as an infinite small x or infinite small change in x. Thank you for answering my question in advance!

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# B The meaning of dx

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