Grade 1 · Science · Lesson 18

Solid, Liquid, Gas Basics

Your book, the juice in your glass, the air you are breathing right now — all of these are matter. Matter is anything that takes up space. Scientists sort all matter into three groups called the states of matter.

What this lesson teaches

1Define solid, liquid, and gas
2Describe the key property that makes each state of matter different
3Sort everyday examples into the correct group

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