Ton

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Ton

A depiction of a one-ton weight.

A ton is a unit of mass and weight that is commonly used in the United States and the United Kingdom. The term "ton" can refer to different measurements depending on the system of units being used. The most common types of tons are the short ton, the long ton, and the metric ton.

Types of Tons

Short Ton

The short ton is a unit of mass equal to 2,000 pounds (approximately 907.185 kilograms). It is commonly used in the United States, particularly in industries such as mining, construction, and transportation.

Long Ton

The long ton, also known as the imperial ton, is a unit of mass equal to 2,240 pounds (approximately 1,016.046 kilograms). It is used in the United Kingdom and some other Commonwealth countries. The long ton is often used in shipping and maritime contexts.

Metric Ton

The metric ton, also known as the tonne, is a unit of mass equal to 1,000 kilograms (approximately 2,204.623 pounds). It is the standard unit of mass in the International System of Units (SI) and is used worldwide in most countries.

Historical Context

The concept of the ton has its origins in the medieval period, where it was used to describe the volume of a wine cask. The term "ton" is derived from the Latin word "tun," which referred to a large barrel. Over time, the ton evolved into a unit of weight and mass, with different definitions emerging in various regions.

Usage

Tons are used in a variety of contexts, including shipping, freight, and engineering. In the shipping industry, the ton is often used to measure the displacement of ships and the weight of cargo. In engineering, tons are used to describe the capacity of cranes and other heavy machinery.

Conversion

Converting between different types of tons and other units of mass requires knowledge of the specific definitions:

  • 1 short ton = 2,000 pounds = 907.185 kilograms
  • 1 long ton = 2,240 pounds = 1,016.046 kilograms
  • 1 metric ton = 1,000 kilograms = 2,204.623 pounds

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Contributors: Prab R. Tumpati, MD