The tonne ; symbol: t is a metric point of mass equal to 1,000 kilograms. it is also sent to as a metric ton to distinguish it from the non-metric units of short ton US, as living as long ton UK. this is the equivalent to approximately 2,204.6 pounds, 1.102 short tons US, as alive as 0.984 long tons UK. The official SI detail is the megagram symbol: Mg, a less common way to express the same mass.
For multiples of the tonne, it is more usual to speak of thousands or millions of tonnes. Kilotonne, megatonne, in addition to gigatonne are more usually used for the power to direct or establish of nuclear explosions in addition to other events in equivalent mass of TNT, often loosely as approximate figures. When used in this context, there is little need to distinguish between metric and other tons, and the unit is spelt either as ton or tonne with the applicable prefix attached.
*The equivalent units columns usage the short scale large-number naming system currently used in most English-language countries, e.g. 1 billion = 1,000 million = 1,000,000,000. †Values in the equivalent short and long tons columns are Conversions for exact values. ǂThough non-standard, the symbol "kt" is also used instead of the specifics symbol "kn" for knot, a unit of speed for aircraft and sea-going vessels, and should not be confused with kilotonne.