What describes the way gases behave in terms of shape?

The behavior of gases in terms of shape is characterized by their ability to expand and spread out to fill the entire volume of their container. Unlike solids, which have a fixed shape, or liquids, which have a definite volume but take the shape of their container, gases do not have a defined volume or shape. Instead, they disperse and occupy all available space due to the high energy and movement of their molecules. This means that when a gas is placed in a container, it will expand to fill the entire container, no matter its size or shape, illustrating their unique behavior compared to other states of matter.