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.
The Middle Ages is the middle period of the three traditional divisions of Western history: Antiquity, Medieval period, and Modern period.The Medieval period is itself subdivided into the Early, the High, and the Late Middle Ages.Depopulation, deurbanisation, invasion, and movement of peoples, which had begun in Late Antiquity, continued in the Early Middle Ages.he High Middle Ages was the formative period in the history of the modern Western state. Kings in France, England, and Spain consolidated their power, and set up lasting governing institutions.