Question

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Explanation:

Identify the measurement boundaries

Using the Diffusion Measurement and Lab Data Recording knowledge points
The left edge of the circular diffusion zone aligns with the \(0\text{ cm}\) mark on the ruler. The right edge of the circular diffusion zone aligns with the \(1.5\text{ cm}\) mark on the ruler.

Calculate the diameter of the diffusion zone

Using the Diffusion Measurement and Lab Data Recording knowledge points

$$ \text{Diameter} = 1.5\text{ cm} - 0\text{ cm} = 1.5\text{ cm} $$

Converting centimeters to millimeters:

$$ 1.5\text{ cm} \times 10\text{ mm/cm} = 15\text{ mm} $$

Answer:

The diameter of the diffusion zone is <blank>\(15\)</blank> mm.