Chemical Fountain Experiment - Demonstrating Gas Solubility and Pressure Change #265168 (License: Personal Use)

This black-and-white line drawing depicts a chemical fountain apparatus where a flask filled with ammonia gas is inverted over a beaker of water, connected via a tube sealed with a stopper. As ammonia dissolves exothermically in water, pressure drops sharply inside the flask, causing water to rush upward and erupt as a fountain. The illustration highlights the reaction’s visual drama and underlying principles of gas solubility and partial vacuum formation.

Used in high school and undergraduate chemistry education to demonstrate gas dissolution, Henry’s law, and pressure differentials; often appears in lab manuals, lecture slides, or science outreach content targeting curious learners.