What is the heat of evaporation?

Evaporation heat, ΔH _{vap , sometimes called enthalpy evaporation, is the amount of energy needed to convert the liquid into a pair at a boiling point. This energy is independent of any component resulting from the temperature increase. The heat evaporation is often measured at atmospheric pressure and the normal boiling point, although this is not always the case. Since the boiling point of any liquid varies with the ambient pressure and the heat of evaporation also depends on this pressure, warm evaporation must be dependent on temperature. Two-dimensional (2-D) graphs show a simple, almost parabolic relationship for most common liquids.}

There are many influences that need to be taken into account if the cooking process or evaporation is to be fully understood. These include intermolecular binding forces such as Van der Waal forces - which include at least in London's dispersion power - and much possible, stronger hydrogen forces. Work must be included for gas expansion. In addition, the potential energy of the liquid to K was largely transformedinetic energy in gas. It is wrong to assume that all this kinetic energy exists in the form of translational energy; Some of them become rotary energy and vibrating energy.

At the basic level, one conceptual model is first described in 2006 in the magazine Fuid Phase Equilibria . In this model, empirical data for 45 elements were well coincided when two assumptions were made: the surface of the liquid is flexible and the particle uses all its latent energy to release the particles blocking its escape - surface resistance. In this study, the maximum surface area was used in the calculations, which can hold the particle in the surrounding liquid. The deviations between the calculations and the reality were explained in terms of approximation, such as the approximation of the hardball sphere for atoms.

Evaporation heat is of great importance for industrial distillation apparatuses. It is also important in situations where VV needs to be neededCast the pressure of par as in the design and function of heating plant plants. One of the mathematical expression of special interest in this regard is Clausius-Clapeyron equation. This equation combines heat evaporation with system pressures and temperatures. Using the equation, the second steam pressure can be determined from one specific temperature and steam pressure at another temperature.