Ship

A ship is a large vessel that floats on water and is used to transport people, cargo, and equipment. It operates on the principle discovered by Archimedes: a body immersed in water experiences an upward force equal to the weight of water it displaces. For this reason, a ship made of heavy material such as iron can float if its shape is designed to displace sufficient water.

The distinction between a ship and a small boat is not based on rigid rules. Generally, a ship is known as a large, ocean-going vessel, while small boats operate in coastal areas, rivers, or serve as auxiliaries to larger ships.

Main components

A ship has a hull that displaces water, a deck, and a bridge where the captain and officers control its movement. It is equipped with an engine, a propeller or screw, and a rudder for steering. Cargo is carried in holds or containers. The point at which weight is balanced and the depth to which the hull sits in the water determine its stability.

Types

There are container ships, tankers, bulk carriers for loose cargo such as grain and ore, fishing vessels, passenger ships, and warships. There are also ferries that connect coastal areas.

Brief history

Early societies used wooden boats powered by oars and sails. Trade in the Indian Ocean, along the coasts of Somalia, Arabia, and India relied on sailing vessels that took advantage of seasonal monsoon winds. In the nineteenth and twentieth centuries, steam and then diesel and metal-hulled engines replaced wooden vessels and sails, increasing both size and speed.

Commerce and law

Most international cargo is transported by sea, because the cost per unit distance is lower than by air or land. Each ship is registered with a country (flag state) whose laws apply to it; international bodies set standards for maritime safety, crew qualifications, and environmental protection.