ABSTRACT
Different processes in the food industry can be studied from the laws that govern the different transfers involved in each process. The application of these fundamental equations allows us to obtain the mathematical model on which the process is based. Previous to this study, it has been necessary to dene the system in which the process will take place and to determine its type, since systems may be classied as closed, open, or isolated. When a system is dened, the possible mass and energy exchanges with the surroundings must be considered. Those transfers will lead to changes in the system, whose components tend to vary, as much in their composition as in their energy state, even being able to undergo chemical reactions.
