Interpretation : The density of a person on the surface of Earth and on the surface of the moon is to be explained.
Concept Introduction : The connectivity between mass and volume is density. The formula of density is given as:

Answer to Problem 68A
The density of a person on the surface of Earth and the surface of the moon will remain the same.
Explanation of Solution
The connectivity between mass and volume is density. The formula of density is given as:
Mass is a measure used to quantify an object in comparison to that standard mass of 1 kilogram.
Any sample of matter takes up space, which is known as volume.
The mass and the volume are independent of the place. They remain the same.
Since the mass and volume are unchanged, the density also remains the same.
So, the density of a person on the surface of Earth and the surface of the moon will remain the same.
Chapter 3 Solutions
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