API gravity measures which of the following?

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Study for the Maritime Cargo Operations and Safety Procedures Test. Learn with flashcards and multiple choice questions, each with hints and explanations. Master marine chemistry, MARPOL, and tank cleaning for your exam success!

Multiple Choice

API gravity measures which of the following?

Explanation:
API gravity measures how dense a petroleum liquid is relative to water. It tells you whether the oil is light or heavy: higher API gravity means lighter oil with lower density than water, while lower API gravity means heavier oil with higher density. It's calculated from the oil’s specific gravity at 60°F, using API gravity = (141.5 / SG60) − 131.5. This concept focuses on density, not viscosity, color, or flammability, which is why it’s used to classify crude oils and predict processing behavior.

API gravity measures how dense a petroleum liquid is relative to water. It tells you whether the oil is light or heavy: higher API gravity means lighter oil with lower density than water, while lower API gravity means heavier oil with higher density. It's calculated from the oil’s specific gravity at 60°F, using API gravity = (141.5 / SG60) − 131.5. This concept focuses on density, not viscosity, color, or flammability, which is why it’s used to classify crude oils and predict processing behavior.

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