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- Thread starter girolamo
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Mark44

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Because the dimensions of the box are dx, dy, and dz. The volume of this box is dV, which is dx * dy * dz.Hi, I don't understand why in some texts they put that infinitesimal volume dV = dx dy dz.

If V = x y z, infinitesimal volume should be dV = y z dx + x z dy + x y dz, by partial differentiation. Thanks

This would be the change in volume of a box whose dimensions are x, y, and z, and whose dimensions change by dx, dy, and dz.

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SteamKing

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It's for the same reason that dA = dx*dy.

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lavinia

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