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A metric ton is a unit of measurement based on the metric system, rather than the standard, or imperial, system more commonly used in the United States. It is known as a tonne in most other countries, and is equivalent to 1,000 kilograms. Strictly speaking, it is a megagram, being one million grams.
The metric ton or 'tonne' is accepted as a synonym for the megagramme, and this form Is to be preferred on the grounds of brevity and familiarity in the industry. It may be as well to use the pronunciation 'tunnie' until the risk of confusion with the old ton has passed. 1972, Which, May 1972