From the table shown in the question;
Volume of aluminum bar = 15.52 cm^3
Volume of the rod = 23.8 cm^3
The volume of the iron bolt can only be obtained by the displacement method.
What is volume?
The term volume refers to the space that is occupied by an object. We know that the volume of an object could be obtained in different ways depending on the nature of the object. If the object is a solid, we could look at the dimensions of the solid or we could use the dimensions of the solid. The actual method that we finally use is peculiar to the object whose volume we intend to measure.
In order to obtain the volume of the aluminum bar;
Volume = length * width * height
Volume = 9.7 * 1.6 * 1.0 = 15.52 cm^3
In order to obtain the volume of the rod;
Volume = Area * length
Volume = 3.14 * (1.7)^2/4 * 10.5
Volume = 23.8 cm^3
We can not obtain the volume of the iron bolt by this method because it is an irregular solid hence we have to use the displacement method.
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