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In the twentieth century, the impact of flight reached into every corner of American society. However, nowhere has its impact been more dramatic than in the realm of military affairs. Over the past one hundred years, the evolution of military aviation technology has altered the way Americans have looked at national security.

This series introduces the core areas of chemical science, covering important concepts in an easy, accessible style. Each title contains a number of experiments and demonstrations, approached through the process of problem, hypothesis, experiment and conclusion. All the books support the QCA schemes of work and contain: definitions of important terms and explanations of key concepts; formulae and word equations; and the periodic table with explanatory notes. This title explores the concepts of the states of matter.

One of the longest and most bitter disputes in twentieth century military affairs has been over the organization of the armed forces, particularly the question of independence of the air forces. The argument over an independent Air Force cut to the very heart of national defense, for who controlled air policy, air doctrine, buying of aircraft, military training, and the structure of the air forces determined the type of military forces the nation would possess and how aviation would be used in war.