The internal energy and temperature of a system decrease (E E. The System and Work. The system is usually defined as the chemical reaction and the boundary is the container in which the reaction is run. In the course of the reaction, heat is either given off or absorbed by the system.
The Middle Ages began in the year 476 A.D. and ended around 1300 with the beginning of the Renaissance. The Middle Ages, also called the Medieval Period, began just after the fall of Rome and it dominated the European continent through the early 14th century. The Middle Ages filled a time period between the ending of a great reign and the beginning of a new era characterized by revitalization and cultural growth.
Some historians say that the Middle Ages began in AD 476, when the barbarian Odoacer overthrew the emperor Romulus Augustulus, ending the Western Roman Empire. Other historians give the year 410, when Alaric, king of the Visigoths, sacked Rome.