wich of these is more heavier, 10liters of water, 10liters of oil or 10kilogrammes of gold
density of water = 1kg/l, so water = 10kg
density of oil depends on the kind of oil, but is usually less than water, so the oil is less than 10kg.
doesn't matter what the density of gold is, since you have 10 kg.
So, it's a tie between water and gold: 10kg each.