Since they both have a weight of 1kg one cannot be heavier than the other.
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Oh, what a lovely question! Both 1kg of rocks and 1kg of feathers weigh the same, my friend. It doesn't matter what they're made of - a kilogram is a kilogram, just like every happy little tree is still a tree, no matter its shape or color. Keep exploring and asking questions, there are no mistakes, just happy little accidents.
1kg = 1000g
Pebbles are heavier because they're rocks. Feathers are lightweight and fur.
1kg = 1000g7.75kg = 7750gSo, 7936g is heavier
Nooo, 1kg gold is heavier 1kg cotton, because the last one has much more volume than the first, so Archimedes force reduces weight of a cotton more!
Well, honey, a kilogram is a kilogram, whether it's feathers, rocks, or even unicorn tears. They all weigh the same because that's just how the metric system works. So, grab yourself a scale and weigh those feathers and rocks - you'll see they tip the scales at the same weight.