With a temperature of T = 293 K.
Lead: 11.3 103 kg m-3
Silver: 10.50 103 kg m-3
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They both weight a kilogram. Lead has a higher density.
Lead
Iron has a greater density.
if the substance of the element has greater density you can make it float by carving it out so weight over volume of the object is lighter in effective density
Density is a weight per unit volume calculation. There could be different alloys or casting methods with subtle differences in density, or temperature variations in expansion and density. However: Every cubic centimeter of lead weighs 11.34 grams. Every cubic centimeter of iron weighs 7.86 grams. Thus, the density of lead (11.34 g/cc) is greater than iron (7.86 g/cc). This is independent of the actual weight and volume of the sample.