Air is a matter because air is our most familiar example of the state of matter we call gas. We live immersed in it and depend on it to stay alive. It's also invisible, not particularly tangible, and can be challenging to investigate. But, like solids and liquids, air is matter. It has weight (more than we might imagine), it takes up space, and it is composed of particles too small and too spread apart to see. Air, a mixture of gases, shares properties with water vapor, the gaseous form of water that is part of air. Understanding air helps us understand water vapor.
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Air is a matter because air is our most familiar example of the state of matter we call gas. We live immersed in it and depend on it to stay alive. It's also invisible, not particularly tangible, and can be challenging to investigate. But, like solids and liquids, air is matter. It has weight (more than we might imagine), it takes up space, and it is composed of particles too small and too spread apart to see. Air, a mixture of gases, shares properties with water vapor, the gaseous form of water that is part of air. Understanding air helps us understand water vapor.
Air is classified as matter because it has mass and takes up space, which is the definition of matter.