@rachelmayatsea: Free surface effect is when liquid in a partially filled tank moves as the ship rolls, shifting the ship’s centre of gravity and reducing stability. What you’re seeing here is free surface effect in action — water sloshing from side to side in a slack fresh water tank. As the ship rolls the water in the tank moves towards the lower side which shifts the center of gravity of the liquid. This results in a movement that acts against the ships natural righting moment. The effect of this fluid movement is to virtually raise the ship's overall center of gravity, a concept known as the "virtual loss of GM" (metacentric height). This loss of stability can be quite significant if you multiply it by several slack tanks around the ship. That’s why, where possible, tanks are kept either pressed up full or completely empty to minimise the effect of free surface. #shiptok #LearnOnTikTok #fyp

Rachel May

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Saturday 08 November 2025 18:36:54 GMT