Discussion
A flow line 2 mm wide represents 500 tonnes. If width is scaled directly with the quantity, what width represents 2,000 tonnes?
Answer: B
Correct answer: 8 mm
Here the *width* is scaled directly with the quantity, not the area, so the relationship is linear: \[ 2 \times \frac{2000}{500} = 2 \times 4 = 8\ \mathrm{mm}. \] The contrast with the proportional circle is worth holding - there the radius took a square root because area was the scaled quantity, whereas a flow line is scaled on one dimension and needs none.
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