Intelligent Energy Ltd 1 article published in JoVE Chemistry A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions Paul Brack1, Sandie Dann1, K. G. Upul Wijayantha1, Paul Adcock2, Simon Foster2 1Department of Chemistry, Loughborough University, 2Intelligent Energy Ltd The study of methods to generate on-demand hydrogen for fuel cells continues to grow in importance. However, systems to measure hydrogen evolution from the reaction of chemicals with water can be complicated and expensive. This article details a simple, low-cost, and robust method to measure the evolution of hydrogen gas.