## Chemistry: The Central Science (13th Edition)

$1\times10^{6}nm$
To convert mm to nm you need a unit fraction that has mm in the denominator and nm in the numerator. $1mm\times\frac{1\times10^{-3}m}{1mm}\times\frac{1\times10^{9}nm}{1m}=1\times10^{6}nm$