What is heavier a kilogram of feathers or a kilogram of lead?
A kilogram of feathers and a kilogram of lead both weigh the same amount - one kilogram. The weight or mass of an object is determined by how much matter it contains, not by its appearance or composition. So, even though feathers are much less dense than lead and take up more space, a kilogram of feathers still weighs the same as a kilogram of lead.
Then why was the 1 kilogram of feathers lighter than the lead when I measured their weights? Did I miss something?