Below is a picture of two blocks made of different materials.
If Block A is located on the Moon and Block B is located on Earth, which of the following is true about the two blocks?
Grams measure mass, not weight. The blocks have the same mass (that is, the same amount of matter) regardless of where they are 25 grams. They would have different weights because of the difference in gravity between Earth and the Moon; we can see in the diagram that they have different volumes; and since their volumes are different but their masses are the same, we know they also have different densities.