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  • Close up of 5 bicycle tires.
    Rights: Evan Goldin Published 5 November 2021 Size: 360 KB Referencing Hub media

    Air behaves in the same way as any other fluid (wē). It flows and spreads into spaces that are not otherwise occupied. Unlike a fluid, however, it can be squashed (compressed). When a bike tyre is pumped up, more and more air is pushed in to that space, and the air is spread evenly throughout the space but under increasing pressure.

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