What is the graph that plots the percentage (by volume) of a given grade of crude which boils off as a function of temperature called?

What is the graph that plots the percentage (by volume) of a given grade of crude which boils off as a function of temperature called?

• A. Vapor Pressure Curve
• B. Boiling Curve
• C. Reflux Curve
• D. Distillation Curve

Answer: (D)

This graph captures how much of a crude's volume boils off as temperature rises. It is called the distillation curve, and it shows the cumulative percentage of the crude that has distilled (boiled off) as the temperature increases during a distillation. This curve highlights the crude’s boiling range and the yields of the various fractions (light ends up to heavier cuts), which is essential for predicting how the crude will behave in processing and what products to expect. The term fits because the chart is built from progressively heating the sample and recording the amount distilled at each temperature, then plotting that recovered percentage against temperature. By contrast, a vapor pressure curve relates vapor pressure to temperature for a liquid and doesn’t depict distillate yield; the other terms aren’t standard descriptors for this specific yield-versus-temperature relationship.

This graph captures how much of a crude's volume boils off as temperature rises. It is called the distillation curve, and it shows the cumulative percentage of the crude that has distilled (boiled off) as the temperature increases during a distillation. This curve highlights the crude’s boiling range and the yields of the various fractions (light ends up to heavier cuts), which is essential for predicting how the crude will behave in processing and what products to expect.

The term fits because the chart is built from progressively heating the sample and recording the amount distilled at each temperature, then plotting that recovered percentage against temperature. By contrast, a vapor pressure curve relates vapor pressure to temperature for a liquid and doesn’t depict distillate yield; the other terms aren’t standard descriptors for this specific yield-versus-temperature relationship.