The unit of a ton is T, and the capital is T, and the ton is a Chinese character, pronounced dūn, which is often used as a unit of mathematical quality, and is often used to measure the weight of larger items in life. One ton equals two thousand kilograms and one thousand kilograms. Tonnage is also divided into tonnage and tonnage class. Tonnage is the cubic capacity of merchant ships, and the unit is 100 cubic feet. Tonnage is the grade of an object (such as a ship) in tons, which is usually used for passenger ships and cargo ships.