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Perhaps no dating method has the wide range of applicability as does the potassium argon dating method from either consideration of the ranges of ages which can be dated or the availability of suitable material to date. Minerals as young as tens of thousands of years to minerals billions of years old have been successfully dated. Many minerals retain for times of the order of billions of years the daughter, Ar40, and many minerals contain as a component K40 the parent element, potassium being a common element in the earth's crust. As a result, most rock contains at least one mineral which can be successfully dated by the potassium argon method. Even though this method has been applied for over fifteen years, there is as yet no work which summarizes the experimental techniques and the results available. The sixtieth birthday ofW. GENTNER, one of the pioneers in this field of research, is a suitable time to present such a summary.

Up-to-date overview of the method for producing the main industrial gases This book covers process design for cryogenic processes like air separation, natural gas liquefaction, and hydrogen and helium liquefaction. It offers an overview of the basics of cryogenics and information on process design for modern industrial plants. Throughout, the book helps readers visualize the theories of thermodynamics related to cryogenics in practice. A central concept in the book is the connection between the theoretical world of process design and the real limitations given by available hardware components and systems. Sample topics covered in Process Design for Cryogenics include: Cryogenic gases like nitrogen, oxygen, argon, neon, hydrogen, helium, and methaneThermodynamicsTypical cryogenic refrigeration processes, including the classic Joule Thomson process, the contemporary mixed-gas Joule Thomson process, and expander-based processes like Brayton and Claude cyclesHelium and hydrogen liquefaction and air separationProcess Design for Cryogenics is a comprehensive must-have resource for engineers and scientists working in academia and industry on cryogenic processes.