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Although ppmv and grains per dscf have been used in the above examples, concentrations such as ppbv (i.e., parts per billion by volume), volume percent, grams per dscm and many others may also be used. 1 percent by volume = 10,000 ppmv (i.e., parts per million by volume).
The volume of the solid formed by rotating the area between the curves of f(y) and g(y) and the lines y = a and y = b about the y-axis is given by V = π ∫ a b | f ( y ) 2 − g ( y ) 2 | d y . {\displaystyle V=\pi \int _{a}^{b}\left|f(y)^{2}-g(y)^{2}\right|\,dy\,.}