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It causes a TON of confusion! ...which is either a lot of confusion, 1000kg of confusion, 2000lb of confusion, 2240lb of confusion, 2400lb of confusion, 1 giga calorie of confusion, 7 giga calories of confusion, 10 giga calories of confusion, 12,000 btu/h of confusion, or 100, 10000, or 100000 unitless amounts of confusion. |
In metric we use the word tonne to disambiguate from the myriad weird, whacky, and deprecated tons used by ~ 5% of the population.