What is the free surface effect?

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Study for the Marine 3/C Test with essential flashcards and multiple-choice questions, offering hints and explanations. Prepare confidently for your exam today!

Multiple Choice

What is the free surface effect?

Explanation:
Free surface effect is when liquid can move freely inside partially filled tanks as the vessel heels or rolls. That movement shifts the overall center of gravity of the ship–fluid system, effectively reducing the metacentric height (GM) and making the boat less stable. Think of the liquid acting like a pendulum: as the ship tilts, the liquid slides to the lower side and then back, which amplifies the heel and increases the risk of capsizing. The effect is stronger in long, wide tanks and becomes negligible when tanks are full or empty.

Free surface effect is when liquid can move freely inside partially filled tanks as the vessel heels or rolls. That movement shifts the overall center of gravity of the ship–fluid system, effectively reducing the metacentric height (GM) and making the boat less stable. Think of the liquid acting like a pendulum: as the ship tilts, the liquid slides to the lower side and then back, which amplifies the heel and increases the risk of capsizing. The effect is stronger in long, wide tanks and becomes negligible when tanks are full or empty.

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