Final answer:
No, solids and liquids do not expand to fill their containers. Gases, on the other hand, do expand to fill their containers.
Step-by-step explanation:
Under normal conditions, there are three distinct states of matter: solids, liquids, and gases. Solids are relatively rigid and have fixed shapes and volumes. Liquids have fixed volumes but flow to assume the shape of their containers, while gases have neither fixed shapes nor fixed volumes and expand to completely fill their containers. So, solids and liquids do not expand to fill their containers; gases do.