It is not. They have exactly the same mass and so must have the same weight.
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They total the same, a handful of sand for example would weigh more than a handful of feathers but because they both add up to a specific weight neither is heavier than the other there would just be more feathers than sand..
Not easier because of the quantity or mass of feathers are larger than 40 lbs of lead
Lead is more dense than feathers. It doesn't matter how much you have of either one. A chip of lead is more dense than a 10-mile convoy of trucks loaded with feathers.
The mass of feathers is far greater than the lead. amount = mass So you will have a huge pile of feathers compared to a small chunk of lead to equal a pound
A pound of feathers because feathers are less dense than lead and therefore take up more volume for the same mass.