<P>In chemical engineering and related fields, a unit operation is a basic step in a process. For example in milk processing, homogenization, pasteurization, chilling, and packaging are each unit operations which are connected to create the overall process. A process may have many unit operations to obtain the desired product. The book will cover many different unit operations as they apply to food processing.</P>

<P>Peter Ho is an Assistant Professor at the Polytechnic Institute of Viana do Castelo’ s School of Technology and Management, Portugal.</P>

<P>Maria Margarida Cortez Vieira is an Associate Professor at the University of Algarve's School of Technology, Portugal.</P>

<P>Kristberg Kristbergsson is Professor of Food Science at the Department of Food Science, Faculty Food Science and Nutrition, University of Iceland, Iceland.</P>