🔍 Key Concepts

• Free surface effect and how it reduces stability • How tank dimensions influence free surface correction • Difference between ship characteristics (like registered tonnage) and tank/contents characteristics

💭 Think About

• Ask yourself: Which options relate directly to the liquid’s ability to move sideways in a tank and shift the center of gravity? • Consider: Is free surface correction based on how much liquid mass you have, or on how that mass can move and spread out? • Think: Which choice describes an overall ship measurement, not a property of the tank or the liquid inside it?

✅ Before You Answer

• Identify which items affect the moment of inertia of the liquid surface (these will affect free surface correction). • Check which factor depends on tank breadth/geometry versus the ship’s overall size rating. • Verify which option is about the ship’s regulatory/measurement status rather than physical stability behavior.