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Question

# Anton van Leeuwenhoek, a $17^{\text {th }}$-century pioneer in the use of the microscope, described the microorganisms he saw as "animalcules" whose length was " 25 thousandths of an inch." How long were the animalcules in meters?

Solution

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This can be solved through simple dimensional analysis. Recall that $1$ inch is equal to 0.0254 m

$\dfrac{1}{25000}\ \text{inch} \cdot \dfrac{0.0254\text{ m}}{1\text{ inch}}=\boxed{1.016\times10^{-6} \text{ m}}$

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