Different substances have different densities. If you're talking about water, then 1 liter masses 1 kilogram, so 16 liters.
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That depends on what the 16 liters of space are full of.If it's air, then very few kilograms. Probably less than 1.If it's water, then 16 kilograms.If it's lead, stone, or gold, then a lot more than 16 kilograms.If the 16 liters of space are empty, then there are zero kilograms of mass in it.
3.6
Depends on the density of the substance in question.
7pi liters
16 US gallons = 60 liters 16 UK gallons = 72 liters