The Gibbs Phase Rule That there is a definite relationship in a system between the number of degrees of freedom, the number of components and the number of phases present was first established by J. Willard Gibbs in 1876. This relation, known as the phase rule, is a principle of the widest generality, and its validity is in no way dependent on any concepts of the atomic or molecular constitution. Credit is due to Ostwald, Roozeboom, Van't Hoff, and others for showing how this generalization can be 'utilized in the study of problems in heterogeneous equilibrium. To arrive at a formulation of the phase rule, consider in general a system of C components in which P phases are present. The problem now is to determine the total number of variables upon which such a system depends. First, the state of the system will depend upon the pressure and the temperature. Again, in order to define the composition of each phase, it is necessary to specify the concentration of (C-1) constitu...
Mesopotamia Civilization Mesopotamia is a region in southwest Asia that is a testament to the evolution of human civilization between the ancient rivers Tigris ( River Dajla) and Euphrates( River Farat). The region looks very developed due to its excellent climate and geography. There are traces of many such inventions due to the development of this period. ۔ These include math, maps, sailing boats, the concept of time, and the wheel. this was located in the Middle East. The region consisted of the Eastern Mediterranean and many countries in Southwest Asia. It is also a Cradle of Civilization, Mesopotamia consists of two words, meso , and potamos meaning middle and river respectively. The human beings for the first time in Mesopotamia of the Paleolithic era (14,000 BC) , get settled in houses that came out from the caves. the people of this era are known as Babylonians. The inhabitants of the region lived in small colonies with circular houses. 5,000 years later, these hou...