Gold.
Explanation: Gold has a higher density than water.
This means, the value of Mass/volume for gold is more than that of water.
Here, the volume is same for both the substances. Then, for the density to vary, the mass should vary because volume is the same. As gold as a higher density, it has more mass than water for the same volume of the substance.
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Water.
1 kilogram
copper
a 1 inch eraser
Density of water is 1000kg/m3. Also, Volume = Mass/Density = 1/1000 = 0.001m3. So, volume of water that has mass of 1 kg is 0.001m3.