The average radius of a molecule of lysozyme, an enzyme in tears, is 1.430 * 10^-3 um. What is its radius in millimeter? Enter your answer in scientific notation.

Basically, this problem tells you to convert micrometers (μm) to millimeters (mm). The prefixes are used as hints for their values. Micrometer is 10⁻⁶ of a meter, while millimeter is 10⁻³ of a meter. If you use dimensional analysis,

(1.430*10⁻³ μm) * (10⁻⁶ m/1 μm) * (1 mm/10⁻³ m) = 1.43*10⁻⁶ mm