Which weighs more, a pound of feathers or a pound of gold?

Question

Which weighs more: a gallon of liquid water or a gallon of ice?

(With "weight" meaning, weight on the same planet, at the same location -- so literally, "which has more mass?")

Answer 1

They both weigh the same. A pound of feathers occupies a larger volume compared to a pound of gold but the force of gravitation exerted upon them is the same.

Answer 2

In vacuum both weigh the same but in air due to buoyant upward force on cotton the net weight will reduce depending upon its volume.

Answer 3

neither, both weigh same. a pound