
When finding $dP$, why there is no more $ΔV$ in the first bracket? (In other words, Why did the author removed $ΔV$ when he went from $ΔP$ to $dp$?)

When finding $dP$, why there is no more $ΔV$ in the first bracket? (In other words, Why did the author removed $ΔV$ when he went from $ΔP$ to $dp$?)
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