If ethanol was used to measure the density of the irregular objects, it would not have affected the results at all.
The volume of irregular objects is obtained by displacement method. A known volume of a liquid is measured out and added to a measuring cylinder.
The irregular solid is now added to the set up and the change in volume is noted. This change in volume corresponds to the volume of the object.
If the mass of the irregular object has been previously determined, the density of the object is:
Density = mass/volume
The kind of liquid (ethanol or water) used to determine the density does not affect the results.
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