The new edition includes necessary adjustments and modernisation of the content to reflect changes and developments in chemical technology. Presenting a wide scope of articles on chemical substances, properties, manufacturing, and uses; on industrial processes, unit operations in chemical engineering; and on fundamentals and scientific subjects related to the field. The Encyclopedia describes established technology along with cutting edge topics of interest in the wide field of chemical technology, whilst uniquely providing the necessary perspective and insight into pertinent aspects, rather than merely presenting information. Set began publication in January 2004 Over 1000 articles More than 600 new or updated articles 27 volumes. New to the Fourth Edition: Information on recent advancements in many clinically relevant areas of pulmonary medicine Update to the infectious diseases chapters that reflect current practice guidelines and recent antimicrobial developments Clearer connection between fundamental science concepts and clinical applications, which reflect current scientific research Latest information on sleep disorders Review of recent recommendations of the American Thoracic Society and European Respiratory Society for the accurate interpretation of pulmonary function tests Appendices that include a respiratory questionnaire, normal values, and commonly used terms & symbols