Some wonderful chemistry concepts can be investigated with this glass demonstration tube! Colorful demonstrations of acids and bases, pH, indicators, and the solubility of gases can be displayed for the whole class to see. The formation of a solid from the diffusion of vapors can be easily seen. Even equilibrium can be explored in the tube. The 24"-long clear flint glass tube has an outer diameter of 14 mm. The tube’s heavy wall thickness provides rigidity and reduces breakage. Two rubber stoppers are provided. ChemFax with sample demonstration included.