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It's difficult at times for younger young scholars to realize that air has mass. Matter is something that has volume (takes up space) and has mass (*can be weighed). Air does take up space, even if we can't see it, and air has weight, even if we can't feel it - and both of these properties can be observed and measured.
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- Knovation Readability Score: 4 (1 low difficulty, 5 high difficulty)