Which statement describes a gas's shape and volume?

Which statement describes a gas's shape and volume?

• A. Indefinite shape or volume
• B. Definite shape
• C. Fixed volume
• D. High density

Answer: (A)

Gases don’t have a fixed shape or fixed volume because their particles are far apart and move freely, so they spread to fill whatever space is available. The container determines the gas’s volume and its shape, making both indefinite. In contrast, solids have definite shape and volume, and liquids have definite volume but take the shape of their container. Gases are low in density compared with solids and liquids, not high in density.

Gases don’t have a fixed shape or fixed volume because their particles are far apart and move freely, so they spread to fill whatever space is available. The container determines the gas’s volume and its shape, making both indefinite. In contrast, solids have definite shape and volume, and liquids have definite volume but take the shape of their container. Gases are low in density compared with solids and liquids, not high in density.