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Chapter 2: Simple Classification of Substances
— Everything around you is matter. Let's learn its language. —
Why this matters
(I still remember the day a student held up a glass of muddy water and asked, "Is this one substance or many?" That single question opened up the whole of this chapter. It will do the same for you.)
Look around you right now. The chair you're sitting on, the air you're breathing, the water in your bottle, the salt in your kitchen — they're all matter. But here's th
