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In a correctly drawn Sankey diagram the total width leaving equals the total width entering because

  • A.the widths are chosen for clarity rather than quantity
  • B.the diagram is a picture of the energy balance
  • C.the losses are drawn to the same scale as the output
  • D.the diagram is normalised to a hundred per cent

Answer: B

Correct answer: the diagram is a picture of the energy balance

A Sankey diagram is the first law drawn to scale: the widths are proportional to the flows, so what enters must equal what leaves in useful output and losses together. If the widths do not balance, the diagram is reporting an incomplete balance rather than a drafting error.

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