Approximate size of a typical nucleus is

The nucleus is a smaller structure enclosed within the cell. For order-of-magnitude comparisons, its typical size is approximated as $1$ micrometer (1\ \mu$m).<br><br>Converting this value to meters:<br>1\ \mu$ m $= 10^{-6}$ m.

Therefore, the approximate size of a typical cell nucleus is $10^{-6}$ m.

Answer: $10^{-6}$ m