Fuel oil begins to come apart when subjected to a vacuum in excess of 10 inches. True or False?

Prepare for the HVAC D-2 License Exam. Study with flashcards and multiple-choice questions. Each question comes with hints and explanations. Get ready for your HVAC certification!

Multiple Choice

Fuel oil begins to come apart when subjected to a vacuum in excess of 10 inches. True or False?

Explanation:
Fuel oil is a blend of hydrocarbons with a range of boiling points. When you apply a vacuum, the boiling points of the components drop. If the vacuum goes beyond about 10 inches of mercury, the lighter fractions begin to vaporize and separate from the heavier fractions, making the oil seem to “come apart.” So this is true: under a vacuum greater than roughly 10 inches of mercury, fuel oil will start to vaporize and fractionate.

Fuel oil is a blend of hydrocarbons with a range of boiling points. When you apply a vacuum, the boiling points of the components drop. If the vacuum goes beyond about 10 inches of mercury, the lighter fractions begin to vaporize and separate from the heavier fractions, making the oil seem to “come apart.” So this is true: under a vacuum greater than roughly 10 inches of mercury, fuel oil will start to vaporize and fractionate.

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