Which statement best describes air?

Which statement best describes air?

• A. Air is a mixture of gases that has mass and takes up space
• B. Air is a single gas with no mass
• C. Air is a liquid that fills spaces
• D. Air cannot move

Answer: (A)

Air is made of a mixture of gases that have mass and take up space. That means air is matter, weighing something and occupying volume, even though you can’t see it. The gases in air, mainly nitrogen and oxygen, are always moving and spread out to fill the space available, so air behaves like a gas and can flow. Because its particles have mass and can move, air also exerts pressure on surfaces and can move as wind.

Air is made of a mixture of gases that have mass and take up space. That means air is matter, weighing something and occupying volume, even though you can’t see it. The gases in air, mainly nitrogen and oxygen, are always moving and spread out to fill the space available, so air behaves like a gas and can flow. Because its particles have mass and can move, air also exerts pressure on surfaces and can move as wind.