Discusses air and water, and provides photographic and textual presentations of laboratory demonstrations investigating their properties. Topics covered in the demonstrations are: composition of air; testing for the presence of liquid or gaseous water, formation and decomposition of water, water of crystallization, the role of water in a variety of reactions, solubility of salts in water, water hardness, air-water interaction, corrosion of metals in air and water. Includes biographical information on five great experimental scientists. Suggested level: secondary.