
Concept explainers
Interpretation:
The method to determine the volume of a powered solid, liquid and a rock needs to be determined.
Concept introduction:
The volume of any substance is the amount of space it occupies.

Explanation of Solution
The volume of a powered soild cannot be determined easily as it does not have any fixed shape. Also, if one put it into a graduated cylinder, due to the space between the particles of powder, correct volume cannot be measured. This is the same case with rock.
The volume of liquid can be taken by pouring it into a graduated cylinder. To determine the volume of powdered solid and rock, it should be placed in liquid. The volume of liquid increases due to this addition and this change is equal to the volume of added substance.
Thus, the amount of liquid displaced by the rock and powdered will be equal to their volume.
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