Neither!!! They both have the same mass at 1 kg.
However, the feathers will occupy a greater volume.
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10 kg is greater than 6 kg. kg is the unit of mass. Hence feather has more mass than lead in this case.
It is not. They have exactly the same mass and so must have the same weight.
The density of a material is defined as its mass per unit volume. A given volume of lead has more mass than a given volume of feathers. In common usage mass often refers to weight, but that is not a very exact usage of it. For this question it may be useful however to think of a given weight of lead per volume and a given weight of feathers.If you have a kg of lead, that is a small piece, a kg of feathers is a large amount.So for a given volume, say a cubic centimeter, the weight of lead is much more than the weight of feathers.
Because sand is a more dense substance than feathers - it has a larger mass-to-volume ratio.
Both objects has equal mass