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Figure 11.3 Producing boiling curves.

Figure 11.3 Producing boiling curves.

Another difference in petroleum refining is how density is defined. In the chemical industry, density is defined as specific gravity or mass per unit volume. The density of a material in petroleum refining is traditionally reported in "degrees American Petroleum Institute" (°API). Specific gravity and °API are inversely related: the higher the specific gravity, the lower the °API:

Degrees API =

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