enthalpy of vaporization

Evaporative cooling works by employing water's large enthalpy of vaporization.

This is characterized by the enthalpy of vaporization.

Compare this to the enthalpy of vaporization of water which is 40.6 kJ/mol.

Can the boiling temperature be changed by changing the gas above the liquid (if the gas does not affect the liquid's enthalpy of vaporization)?

See Enthalpy of vaporization.

Values of the solubility parameter for simple liquids can be readily calculated from the enthalpy of vaporization.

A high enthalpy of vaporization (hfg)

Because of its convenience, the rule is used to estimate the enthalpy of vaporization of liquids whose boiling points are known.

The entropy of vaporization is defined as the ratio between the enthalpy of vaporization and the boiling temperature.

Water's sizable enthalpy of vaporization is why one's skin can be burned so quickly as steam condenses on it (heading from red to green in Fig. 7 above).

The enthalpy of vaporization can be viewed as the energy required to overcome the intermolecular interactions in the liquid (or solid, in the case of sublimation).

Enthalpy of vaporization, defined as the enthalpy change required to completely change the state of one mole of substance between liquid and gaseous states.

Rao and Ganguly note that elements with an enthalpy of vaporization (EoV) greater than 42 kJ/mol are metallic when liquid.

Hence helium has a particularly low enthalpy of vaporization, 0.0845 kJ/mol, as the van der Waals forces between helium atoms are particularly weak.

For instance, the energy required to completely boil or vaporize water (what is known as enthalpy of vaporization) is roughly 540 times that required for a one-degree increase.

Most designs take advantage of the fact that water has one of the highest known enthalpy of vaporization (latent heat of vaporization) values of any common substance.

The enthalpy of sublimation (also called heat of sublimation) can be calculated as the enthalpy of fusion plus the enthalpy of vaporization.

For boiling to occur, either the dimer bonds must be broken, or the entire dimer arrangement must be vaporised, both of which increase enthalpy of vaporization requirements significantly.

For the second task, there is an equation called the Clausius-Clapeyron equation which relates the boiling point of any liquid based on two variables, the external pressure and the enthalpy of vaporization.

High ethanol blends present a problem to achieve enough vapor pressure for the fuel to evaporate and spark the ignition during cold weather (since ethanol tends to increase fuel enthalpy of vaporization).

Estimation of the enthalpy of vaporization of electrolyte solutions can be simply carried out using equations based on the chemical thermodynamic models, such as Pitzer model or TCPC model.

Different force fields can be derived from dissimilar types of experimental data, such as enthalpy of vaporization (OPLS), enthalpy of sublimation, dipole moments, or various spectroscopic parameters.

This leads to the result , where R is the molar gas constant, M is the solvent molar mass and ΔH is the solvent molar enthalpy of vaporization.

Water's highly energetic enthalpy of vaporization is also an important factor underlying why solar pool covers (floating, insulated blankets that cover swimming pools when not in use) are so effective at reducing heating costs: they prevent evaporation.

This results in systematic group trends: as one goes down group 18, the atomic radius, and with it the interatomic forces, increases, resulting in an increasing melting point, boiling point, enthalpy of vaporization, and solubility.