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Both are equal
Depends if they weigh 1 kilogram where they are or one kilogram compared to Earth's gravitational pull.
~The kilogram technically does not measure weight, it measures mass. If all the items you mention have the same mass then the densest material (iron) has the greatest weight because it displaces the least volume of air. A balloon filled with one kilogram (around 5600 liters) of helium will float in the air. If you want to measure weight, the proper unit is the Newton.
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Which has the greater density a kilogram of feathers of kilogram of iron?
Iron has a greater density.
Which is heavier 10 pounds of feathers or 10 pounds of iron?
These two quantities both weigh the same- 10 pounds.
Which takes up the most space a pound of feathers or a pound of iron?
Feathers
Which is have a greater volume 1 kilogram of copper and 1 kilogram of iron?
Oh, what a lovely question! You see, both 1 kilogram of copper and 1 kilogram of iron have the same weight because they both weigh 1 kilogram. However, copper is denser than iron, so a 1-kilogram block of copper will take up less space than a 1-kilogram block of iron. It's all about how tightly packed the atoms are in each material.
What is heavier 1 cubic centimeter of gold or 1 cubic centimeter of iron?
gold it is thre times heavier!
