pressure vapour

. In such a state, although the amount of liquid level in the vessel does not change, evaporation has not stopped and the system is not at rest. In fact, the number of molecules, which escape from the liquid to the gaseous phase (due to evaporation), becomes equal to the number of vapour ..

Vapour pressure is defined as the partial pressure exerted by the vapors above the liquid surface in equilibrium with liquid at a given temperature. fig 3.3 In illustrations 1a and 1b, the liquid and vapor states of a given substance are represented. The individual mol..

Vapour density is the ratio of the mass of a volume of a gas, to the mass of an equal volume of hydrogen, measured under the same conditions of temperature and pressure. According to Avogadro's law, equal volumes of all gases contain equal number of molecules. Thus, let the n..

Liquid-Gas (vapour) Equilibrium - When a liquid is placed in an open container it disappears completely after some time. However, when the same liquid is placed in a closed container, even after a long period only a part of the liquid disappears. The obvious difference is that the va..

Lower the atmospheric pressure, higher is the rate of transpiration. Water Movement through the leaf to the atmosphere in the form of vapour..

Vapour pressure is defined as the partial pressure exerted by the vapors above the liquid surface in equilibrium with liquid at a given temperatur..

The total vapor pressure, P exerted by the solution is the sum of P A and P B as required by Dalton's law of partial pressures. P = P A + P B or P = P o A c A + P o B c B = P o A (1- c B ) + P o B c B [because c A + c B = 1] = P o A - P o A c B + P o B c B P = (P o B - P o A ) c..

Vapor Pressure of Solutions - Let us suppose a small amount of a non-volatile solute (sugar) is dissolved in a solvent (water). When evaporation of this solution takes place, only water evaporates as the other component (i.e., sugar) is non-volatile. The vapor pressure of the so..

The vapour pressure of a liquid depends upon the nature of the liquid. When intermolecular forces are weak, the molecules tend to escape readily and therefore, the equilibrium vapour pressure is high. Vapour pressure of liquids provides a..