transport phenomenion problem

buchi

i got this from my notws and i jsut can't seem to figure out how the second step is obtained? can someone explain to me where the where r's in the numerator came from on the second line when dividing by the volume of the shell?

matematikawan

That is the original r from the previous equation.

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buchi	transport phenomenion problem Tweet i got this from my notws and i jsut can't seem to figure out how the second step is obtained? can someone explain to me where the where r's in the numerator came from on the second line when dividing by the volume of the shell? Attached Thumbnails

matematikawan	That is the original r from the previous equation.