Required fields are marked *. In meteorology, latent heat flux is the flux of energy from the Earth's surface to the atmosphere that is associated with evaporation or transpiration of water at the surface and subsequent condensation of water vapor in the troposphere. Latent heat of fusion, also known as enthalpy of fusion, is the amount of energy that must be supplied to a solid substance (typically in the form of heat) in order to trigger a change in its physical state and convert it into a liquid (when the pressure of the environment is kept constant). If the vapor then condenses to a liquid on a surface, then the vapor's latent energy absorbed during evaporation is released as the liquid's sensible heat onto the surface. Performance & security by Cloudflare, Please complete the security check to access. The latent heat of fusion of a substance is the amount of heat required to convert a unit mass of the solid into liquid without change in temperature The latent heat of melting for some common solids are indicated below: 1 kJ/kg = 0.4299 Btu/lbm = 0.23884 kcal/kg If unit mass of the substance is considered, the energy required to convert it into a liquid under constant pressure is called the specific heat of fusion for the substance. An example of the latent heat of solidification can be observed in the cooling of water. These names describe the direction of energy flow when changing from one phase to the next: from solid to liquid, and liquid to gas. Latent heat of fusion, also known as enthalpy of fusion, is the amount of energy that must be supplied to a solid substance (typically in the form of heat) in order to trigger a change in its physical state and convert it into a liquid (when the pressure of the environment is kept constant). James Prescott Joule characterised latent energy as the energy of interaction in a given configuration of particles, i.e. At this temperature, the water undergoes crystallization and becomes a solid. The terms ″sensible heat″ and ″latent heat″ refer to energy transferred between a body and its surroundings, defined by the occurrence or non-occurrence of temperature change; they depend on the properties of the body. Similarly, some positive magnitude of energy is released by almost all liquids when they become solids. Therefore, the energy required to dissociate the intermolecular forces of attraction between the liquid particles is also relatively lower when compared to solids. 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The English word latent comes from Latin latēns, meaning lying hidden. It can be noted that the opposite of latent heat of fusion is the heat of solidification, which is the amount of energy that must be supplied to a liquid in order to facilitate a phase change and the conversion of the liquid into a solid. For example, the amount of energy absorbed by ice to become water is equal to the amount of energy liberated by water to become ice. One of the few known exceptions to this is the element helium. For sublimation and deposition from and into ice, the specific latent heat is almost constant in the temperature range from −40 °C to 0 °C and can be approximated by the following empirical quadratic function: As the temperature (or pressure) rises to the critical point, the latent heat of vaporization falls to zero. Unless specified to be otherwise, the pressure of the environment (when expressing the latent heat of fusion of a substance) is always assumed to be 1 atmosphere of pressure (which is roughly equal to 101.325 kilopascals). ″Sensible heat″ is ″sensed″ or felt in a process as a change in the body's temperature. {\displaystyle T} This temperature point can also be referred to as the freezing point of the substance when the heat of solidification is being considered. The latent heat of fusion is the enthalpy change of any amount of substance when it melts.

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