This dictionary provides concise explanations for hundreds of key terms from chemistry and related subjects. Designed to meet the particular needs of school and university students, it should also be useful to non-scientists who want to gain a better understanding of the way in which the world works. From air to autocatalysis, calcium, carbon and copper, to helium and hydrogen peroxide, reaction to stereoisomerism and thermal to zinc, the dictionary is designed to demystify the chemical structure of our everyday world.