We know that the earth is composed of numerous substances such as metals, non-metals, water and other materials. Therefore we can not determine exact density of the earth .For our convenience, here, we are assuming that the earth is made of homogeneous substance and it has a perfect spherical shape, however which is not true.
We know that the density of a substance is given by:
density = mass / volume
For earth:
r = Me / Ve
Let the earth is a sphere of homogeneous composition , therefore its volume is given by:
Ve = 4/3(pR3e)
Hence the average density of the earth is: | |
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