None.
2 cm is a measure of length: with no width and height there is no volume and so no mass.
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water has less density than lead. Mass depends on its volume
One litre of feathers would have far less mass than one litre of lead.
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.
There is no such number since half that number would still be greater than 0 but would be smaller than it.
Is -25 greater than 20