1. Light displacement is the weight of a ship excluding cargo, fuel, water, ballast, stores, passengers, and crew, but with water in boilers. Deadweight is the difference between light and load displacement. 2. Load displacement includes cargo, passengers, fuel, water, stores, and dunnage for a voyage. Displacement is the weight of water a ship displaces, equal to its volume times the density of water. 3. Various coefficients are used to calculate properties of ships based on their shape, including the coefficient of fineness of waterplane area, block coefficient, midships coefficient, and prismatic coefficient. The block coefficient represents the ratio of a ship's underwater volume to the