latent heat of fusion and vaporization pdf Tuesday, December 15, 2020 1:32:05 PM

Latent Heat Of Fusion And Vaporization Pdf

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Latent heat , energy absorbed or released by a substance during a change in its physical state phase that occurs without changing its temperature. The latent heat associated with melting a solid or freezing a liquid is called the heat of fusion ; that associated with vaporizing a liquid or a solid or condensing a vapour is called the heat of vaporization. The latent heat is normally expressed as the amount of heat in units of joules or calories per mole or unit mass of the substance undergoing a change of state. Because the heat of vaporization is so large, steam carries a great deal of thermal energy that is released when it condenses, making water an excellent working fluid for heat engines. Latent heat arises from the work required to overcome the forces that hold together atoms or molecules in a material.

Latent heat

The enthalpy of vaporization is a function of the pressure at which that transformation takes place. The enthalpy of vaporization is often quoted for the normal boiling temperature of the substance. Above the critical temperature , the liquid and vapor phases are indistinguishable, and the substance is called a supercritical fluid. The enthalpy of condensation or heat of condensation is by definition equal to the enthalpy of vaporization with the opposite sign: enthalpy changes of vaporization are always positive heat is absorbed by the substance , whereas enthalpy changes of condensation are always negative heat is released by the substance. It is equal to the increased internal energy of the vapor phase compared with the liquid phase, plus the work done against ambient pressure. The increase in the internal energy can be viewed as the energy required to overcome the intermolecular interactions in the liquid or solid, in the case of sublimation.

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Latent heat also known as latent energy or heat of transformation is energy released or absorbed, by a body or a thermodynamic system , during a constant-temperature process — usually a first-order phase transition. Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature. Examples are latent heat of fusion and latent heat of vaporization involved in phase changes , i. The term was introduced around by British chemist Joseph Black. It is derived from the Latin latere to lie hidden.


solid to liquid, L is known as the latent heat of fusion, Lf, and for a liquid to gas transition, it is known as the latent heat of vaporization, Lv. For water, the latent.


Explain the role of latent heat in the change of state of a substance .

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Latent Heat, Heat Of Fusion, Heat Of Vaporization Problems And Solutions

The enthalpy of vaporization is a function of the pressure at which that transformation takes place. The heat of vaporization diminishes with increasing temperature and it vanishes completely at a certain point called the critical temperature Critical temperature for water:

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5 Comments

Reina P. 18.12.2020 at 13:37

where L is the latent heat of fusion or vaporization, depending on the phase transition that occurs. In this experiment, an ice cube of mass mt, assumed to be at.

Roslyn G. 19.12.2020 at 19:02

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Maworcurat1963 24.12.2020 at 01:58

Solids can be heated to the point where the molecules holding their bonds together break apart and form a liquid.

Hayden B. 24.12.2020 at 11:06

Latent heat also known as latent energy or heat of transformation is energy released or absorbed, by a body or a thermodynamic system , during a constant-temperature process — usually a first-order phase transition.

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