No, a gas can fill the space of any container
A gas has no fixed volume or shape.
Gas
a gas
A gas is a substance with no definite shape or volume.
A Gas has neither a fixed Volume or Shape.
a gas
A gas
Solid: Particles are tightly packed together, have a fixed shape and volume, and vibrate in place. Liquid: Particles are close together but can flow and take the shape of their container, with a fixed volume. Gas: Particles are far apart, move freely, have no fixed shape or volume, and fill the entire container they are in.
The matter that can change shape and volume is gas.
A gas is something without a fixed shape or volume because its particles are widely spread out and move freely.
A solid has a fixed volume and shape. Like a bar of soap. A liquid has a fixed volume, but no fixed shape, like water. A gas has no fixed volume and no fixed shape. Like a burp. If you pour mouthwash into a glass, it still has volume, but now it takes on the shape of the glass. Hmmm. Sounds mighty liquidy, does it not?
Gas will take the shape of whatever container it is in. One of the characteristics of a gas is that it has no definite shape or volume.