**The How and Why Wonder Book of AIR and WATER** explains the scientific principles of gases and liquids by displaying simple experiments with air and water. **Produced and approved by noted authorities, The How and Why Wonder books answer the questions most often asked about science, nature and history.** They are presented in a clear, readable style, and contain many colorful and instructive illustrations. Readers will want to explore each of these fascinating subjects and **collect these volumes as an authentic, ready-reference, basic library.**

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