1 Liter is already 1 Kilogram :)
Assuming mL=cubic centimeters, 1000mL=1000 cubic centimeters
1000 cubic centimeters = 1000 x cm x cm x cm=1000 x 0.1 dm x 0.1 dm x 0.1 dm=1 cubic decimeter
1000mL=1 Liter (as you already know that)
Therefore, 1000 cubic centimeters = 1000 mL = 1 L = 1 cubic decimeter
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