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I think the original definition of a gramme was that it was a cubic centimetre of water at melting point, at sea level. That makes a cubic metre a metric tonne.
Except it’s not, it’s a bit less. Also water is densest at 4 degrees but I don’t know if the units were re-defined to account for that or not and cba to utfs.
AlexD
I think I've posted this before, and someone inevitably posted the reason, but
Why is it a kilogram? 1 litre should = 1 gram surely. Arbitrarily a thousand times smaller.