They both weigh the same, 1 kg
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The weight of a body in air is its apparent weight because the body body remains immersed in air . Therefore apparent weight of 1kg cotton and one kg iron is same .But volume of 1 kg cotton is greater than the volume of 1 iron
Their mass is the same.
Since one Kg of iron is much more dense (the weight is concentrated in a smaller area) than cotton, it takes up less space.
One kg
1,000g