Which property of gases allows them to expand and fill a container? Indefinite shape Fluidity Compressibility Low density

## Step 1<br />The problem asks us to identify the property of gases that allows them to expand and fill a container. The options provided are: Indefinite shape, Fluidity, Compressibility, and Low density.<br /><br />## Step 2<br />Let's analyze each option:<br /><br />### Indefinite shape<br />This property refers to the fact that gases do not have a fixed shape. They take the shape of their container. However, this property does not explain why gases fill a container.<br /><br />### Fluidity<br />This property refers to the ability of gases to flow and take the shape of their container. This property explains why gases fill a container.<br /><br />### Compressibility<br />This property refers to the ability of gases to be compressed. This property does not explain why gases fill a container.<br /><br />### Low density<br />This property refers to the fact that gases have a low density compared to solids and liquids. This property does not explain why gases fill a container.<br /><br />## Step 3<br />Based on the analysis, the property of gases that allows them to expand and fill a container is Fluidity.