Which has more mass: an armful of feathers or an armful of lead? which has more volume: a kilogram of feathers or a kilogram of lead? which has higher density: a kilogram of feathers or a kilogram of lead?
mass is related to weight. It measures the resistance of the substance to acceleration when a net force is applied. Therefore: armful of lead has more mass
volume measures the amount of 3-dimensional space that an object occupies. Therefore: kilogram of feather has more volume as it is less dense.
density is the mass per unit volume. Since armful of lead has more mass than a handful of feathers, while kilogram of feather has more volume than a kilogram of lead. Therefore: kilogram of lead has higher density.