Foams are ubiquitous in our daily lives. Their presence is highly desirable in certain foods, drinks and cosmetics, and they are essential in oil recovery and mineral extraction. In some industrial processes (such as the manufacture of glass, paper and wine) foams are an unwelcome by-product.Why do they appear? What controls the rate at which they disappear? Do they flow in the same way as ordinary liquids? All of these questions and more are addressed here, incorporating significant recent contributions to the field of foams. This book is the first to provide a thorough description of all aspects of the physico-chemical properties of foams. It sets out what is known about their structure, their stability, and their rheology. Engineers, researchers and students will find descriptions of all the key concepts, illustrated by numerous applications, as well as experiments and exercises for the reader. A solutions manual for lecturers is available via the publisher's web site.This is an open access publication, available online and distributed under the terms of the Creative Commons Attribution-Non Commercial-Share Alike 3.0 IGO licence (CC BY-NC-ND 3.0 IGO). It is free to read at Oxford Scholarship Online and offered as a free PDF download from OUP and selected open access locations.This study was well-received and widely discussed when it appeared in hardback in 1990. It is devoted to analysis of the enduring problem of hunger in the modern world, and of the role that public action can play in countering it.The book is divided into four parts. The first attempts to provide a coherent perspective on the complex nutritional, economic, social and political issues involved in the causation of hunger and deprivation. The second deals with famine prevention, paying special attention to Africa and India. The third focuses on chronic undernourishment and related deprivations. Parts two and three include a number of case studies of successful public action for the prevention of hunger and famines invarious parts of the world. The fourth part of the book draws together the main themes and concerns of the earlier chapters, and provides an integrated view of the role of public action in eliminating hunger.
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