Volatile oil is defined as oil with fewer heavy molecules and more intermediates than black oils.

Volatile oil is defined as oil with fewer heavy molecules and more intermediates than black oils.

• A. Light oil
• B. Residual oil
• C. Black oil
• D. Volatile oil

Answer: (D)

Volatile oil describes crude with a higher fraction of lighter and intermediate hydrocarbons and fewer heavy molecules compared with black oil. Because it contains more mid-range and light components, it has higher volatility and tends to vaporize more readily as pressure or temperature conditions change. The statement exactly captures that idea—volatile oil is defined by having fewer heavy molecules and more intermediate (and lighter) components than black oil. The other terms don’t fit this definition: light oil implies even lighter fractions, residual oil is rich in heavy molecules, and black oil is the heavier baseline used for comparison.

Volatile oil describes crude with a higher fraction of lighter and intermediate hydrocarbons and fewer heavy molecules compared with black oil. Because it contains more mid-range and light components, it has higher volatility and tends to vaporize more readily as pressure or temperature conditions change. The statement exactly captures that idea—volatile oil is defined by having fewer heavy molecules and more intermediate (and lighter) components than black oil. The other terms don’t fit this definition: light oil implies even lighter fractions, residual oil is rich in heavy molecules, and black oil is the heavier baseline used for comparison.