Physics investigatory projects for class 12 cbse free download on logic gates

Water molecules are in a constant state of evaporation and condensation flux near the surface of liquid water. water), Leaving behind the dry, less volatile component. In the separation of mixtures, in which a mixture is heated to drive off the more volatile component (e.g. This means that the entropy change for evaporation ( H) is always positive. Gas has less order than liquid or solid matter, and thus the entropy of the system is increased, which always requires energy input. When the process of escape and return reaches equilibrium, the vapor is said to be 'saturated and no further change in either vapor pressure and density or liquid temperature will occur. Many of the molecules return to the liquid, with returning molecules becoming more frequent as the densityДЄnd pressure of the vapor increases. If the evaporation takes place in a closed vessel, the escaping molecules accumulate as a vapor above the liquid. Also, as the faster-moving molecules escape, the remaining molecules have lower average kinetic energy, and the temperature of the liquid thus decreases. Since only a small proportion of the molecules areLocated near the surface and are moving in the proper direction to escape at any given instant, the rate of evaporation is limited. Evaporation therefore proceeds more quickly at higher temperature and in The thermal motion of a molecule must be sufficient to overcome the surface tension of the liquid in order for it to evaporate, that is, its kinetic energy must exceed the work function of cohesion the surface. TheoryEvaporation is the process whereby atoms or molecules in a liquid state gain sufficient energy to enter the gaseous state.

Without their help and proper guidance my project might not havecompleted. Thisinvestigatory project in the KendriyaVidyalaya s ChemistryLab. Lab stafffor the successful completion of I am greatly thankful for the cooperation and help from schoolauthorities and the Chemistry

Physics investigatory projects for class 12 cbse free download on logic gates