Do you know if a piece of lead will weigh down an equal bulk of iron?

So, if I try to form a parallelepiped with these three sides, and P is not in the plane, then it will have some volume.

These units boil down to number, weight, or volume.

An object about the size of Mars - half the size of Earth - slammed into our planet very early in its formation, the theory says.

Now, if I want to change those quantities; change the temperature, change the volume, how will it change?