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1 mm = 1m*10^-3

1 um = 1m *10^-6

thus 1mm^3 = 1m^3*10^-9

1 um^3 = 1m^3*10^-18

==> 1mm^3 = 10^9 um^3

using um for micrometer (micron). dimensional homogeneity is your friend!

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15y ago

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