kilograms is a unit of mass, millilitres is a unit of volume. You can't compare one with the other, unless you also know the density of the substances you are measuring.
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pound is heavier....as 1 pound=1000 kilograms
1 gram of water = 1 milliliter of water, and 2.9 kilograms = 2900 grams, so 2.9 kilograms of water take up a volume of 2900 milliliters, or 2.9 liters.
No.
Yes as there are 1000 grams in a kilogram
a kilogram is 1000 grams, so 450 grams is less than 1 kilograms. 4 kilograms are more than 3, so 4 kilograms is the heaviest.