Question

Imagine an elevator crowded with too many passengers for such a small space. This situation would be a good analogy for a substance with what property

Answer 1

This situation is a good analogy for a substance with a very high density.
The density of any substance is the mass per unit volume. In this case, the mass confined in the given volume is very high, which is the case for a substance with a high density. The particles in the material are also closely packed.