Which of the following is true about density and states of matter for most substances?

Question

A.
A substance is denser as a gas than as a solid.
B.
A substance is denser as a gas than as a liquid.
C.
A substance is denser as a solid than as a gas.
D.
A substance is denser as a liquid than as a solid.

Answer 1

The correct answer is:

C. A substance is denser as a solid than as a gas.

In general, solids are denser than liquids, and liquids are denser than gases for most substances. This is due to the arrangement of particles: in solids, particles are closely packed together, while in gases, particles are much farther apart. There are exceptions (like water, which is less dense as a solid than as a liquid), but for most substances, option C is the most accurate statement.