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They both weight a kilogram. Lead has a higher density.
They both weigh one kg, so they should have the same weight.
Please note that a kilogram is a unit of mass - NOT a unit of weight. And yes, a pencil has a mass that is considerably less than a kilogram. For comparison, a kilogram is the mass of a liter of water.
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.
lead has much higher density
They both weight a kilogram. Lead has a higher density.
They both weigh the same: 1kg = 1kg. The kg of butter has a greater volume and the kg of lead has a higher density.
Butter has greater volume than lead because butter has more mass.
air has no weight
They both have the same value
Both would weigh 1 Kilogram with a difference of volume.
Their masses are the same, so they have the same weigh whenever they're both on the same planet. A kilogram is a kilogram, no matter what form it takes. 1 kilogram is the exact same measure. Its like asking which is longer, a centimeter of chalk or a centimeter of candy. It's also the same as asking: What weighs more, a pound of feathers or a pound of lead ?
They are exactly equal . . . an important concept in understanding gravity.
A kilogram of butter as it is less dense than lead.
erm, 49 kg?
Volume is the amount of 3-dimensional space occupied by an object and has nothing whatsoever to do with the molecular composition of the object. The volume of a 1" x 1" x 1" cube of lead is exactly the same as the volume of a 1" x 1" x 1" cube of butter or a 1" x 1" x 1" cube of anything for that matter. Lead and butter have a great many differences, but volume isn't a measure of any of them.
There is none. Consider a kilogram of air and a kilogram of lead. The two will have considerably different volumes.