Sankey diagrams

Sankey diagrams are a specific type of flow diagram, in which the width of the arrows is shown proportionally to the flow quantity.

Sankey diagrams are typically used to visualize energy or material or cost transfers between processes. They can also visualize the energy accounts, material flow accounts on a regional or national level, and also the breakdown of cost of item or services.[1]

Sankey diagrams put a visual emphasis on the major transfers or flows within a system. They are helpful in locating dominant contributions to an overall flow. Often, Sankey diagrams show conserved quantities within defined system boundaries.

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