# latent heat

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## latent heat,

heat change associated with a change of state or phase (see states of matterstates of matter,
forms of matter differing in several properties because of differences in the motions and forces of the molecules (or atoms, ions, or elementary particles) of which they are composed.
). Latent heat, also called heat of transformation, is the heatheat,
nonmechanical energy in transit, associated with differences in temperature between a system and its surroundings or between parts of the same system. Measures of Heat
given up or absorbed by a unit mass of a substance as it changes from a solid to a liquid, from a liquid to a gas, or the reverse of either of these changes. It is called latent because it is not associated with a change in temperature. Each substance has a characteristic heat of fusion, associated with the solid-liquid transition, and a characteristic heat of vaporization, associated with the liquid-gas transition. The latent heat of fusion for ice is 80 calories per gram (see caloriecalorie,
abbr. cal, unit of heat energy in the metric system. The measurement of heat is called calorimetry. The calorie, or gram calorie, is the quantity of heat required to raise the temperature of 1 gram of pure water 1°C;.
). This amount of heat is absorbed by each gram of ice in melting or is given up by each gram of water in freezing. The latent heat of vaporization of steam is 540 calories per gram, absorbed during vaporizationvaporization,
change of a liquid or solid substance to a gas or vapor. There is fundamentally no difference between the terms gas and vapor, but gas is used commonly to describe a substance that appears in the gaseous state under standard conditions of pressure and
or given up during condensationcondensation,
in physics, change of a substance from the gaseous (vapor) to the liquid state (see states of matter). Condensation is the reverse of vaporization, or change from liquid to gas.
. For a substance going directly from the solid to the gas state, or the reverse, the heat absorbed or given up is known as the latent heat of sublimationsublimation
, change of a solid substance directly to a vapor without first passing through the liquid state. The term is also used to describe the reverse process of the gas changing directly to the solid again upon cooling.
.

## latent heat

[′lāt·əŋt ′hēt]
(thermodynamics)
The amount of heat absorbed or evolved by 1 mole, or a unit mass, of a substance during a change of state (such as fusion, sublimation or vaporization) at constant temperature and pressure.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## latent heat

The amount of heat which is absorbed or evolved in changing the state of a substance without changing its temperature, e.g., in freezing or vaporizing water.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
One of the main disadvantages of using LCs for thermal stabilization is relatively high cost, corresponding to the relatively small amount of latent heat. Nevertheless, LCs have potential for future applications as PCMs, especially in the space industry.
Uzun, "Poly (ethylene glycol)/acrylic polymer blends for latent heat thermal energy storage," AIChE Journal, vol.
Therefore, the failing of representation of the vegetation distribution in South China and negative model bias for precipitation led to the negative bias for simulations of evapotranspiration and surface evaporation, which is possibly the reason for the large bias for simulation of latent heat flux in South China during summer.
Caption: FIGURE 8: The latent heat flux estimated based on FV technique, L[E.sub.FV], versus the one estimated by forcing the energy balance closure, L[E.sub.EB].
We hypothesize this may exhibit a delayed energy conversion from latent heat to mechanical energy, however the energetic dynamics warrant further study especially with respect to OAI behavior.
The use of a latent heat Eutectic aluminum silicon alloy, AlSi12, is a striking phase change material because of its temperate melting temperature, high thermal conductivity, and high heat of fusion.
This type of UFHS does not require an additional supply of heat energy but uses stored latent heat to maintain a constant temperature [21-41].
Latent heat energy storage system using Phase Change Material (PCM) is of interest to researchers because of its many advantages, its high storage capacity being among them.

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