This is the mass which must be added to, or deducted from, a ship in order to change its mean draught by 1 cm. If the ship changes its mean draught by 1 cm and if AW mﾲ is the area of the water- plane at which it is floating, then: Change of volume = AW x 0.01 m Change of displacement = AW x 0.01 x 1.025 tonnes in salt water TPC = AW x 0.01025 = AW 97.5 or TPC = AW x 0.01 tonnes fresh water = AW 100
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