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.

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

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

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