Gas

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Technical gases are used in almost every field of industry, science and medicine and also as a means of control by government authorities and institutions and are regarded as indispensable means of assistance. In this complete handbook of purified gases the physical foundations …

There may be no more decisive environmental issue in America today than hydrofracking, or 'fracking' as it is commonly called, referring to the use of highly pressurized water and chemicals to extract gas trapped in subterranean shale formations. Opponents decry its pollution of…