Author: Khan Academy via YouTube
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Our new middle school chemistry course launches in July 2025, but we couldn’t wait to share it! Videos like this one are rolling out over the next few months to give you a sneak peek of what’s to come. 🧪💡

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Matter exists in three main states: solids, liquids, and gases, each with unique particle arrangements and behaviors. Particles range from being tightly packed, with a definite shape and volume, to moving freely, with no fixed shape or volume. Understanding these states of matter helps us see why solids are rigid, liquids flow, and gases expand to fill spaces.

00:00 Intro
00:29 Solids and their properties
01:28 Liquids and their properties
02:40 Gases and their properties
03:43 Summary

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