Virtual reduction of meta centric height due to free surface is termed as free surface effect.
When a tank onboard a ship is not completely full of liquid, and the vessel heels, the liquid move across the tank in same direction as heel.
The centre of gravity moves away from the centre line reducing the righting lever and increasing angle of heel.
When a tank onboard a ship is not completely full of liquid, and the vessel heels, the liquid move across the tank in same direction as heel.
The centre of gravity moves away from the centre line reducing the righting lever and increasing angle of heel.
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