Heat that's taken up or given off during a change of state.

The amount of heat needed to change a unit of substance, such as water, from a solid to a liquid without change in temperature or pressure.

Heat that when added to or removed from a substance causes a change of state but not a change in temperature.

the amount of energy needed to accomplish a phase change. Latent heat of fusion is the amount of energy required to melt ice, and at 0°C is 3.34 * 105J kg-1 (or about 80 cal/g). The latent heat of vapourisation is the amount of energy needed to evaporate liquid water. It is equivalent to 2.50 * 106 J kg-1 (or about 600 cal/g) at 0°C. The latent heat of sublimation is the energy needed to carry out a change from solid (ice) to gas (vapour). It is the sum of the latent heats of fusion and vapourisation, i.e. 2.83 * 106 J kg-1 (or about 680 cal/g) at 0°C. When water freezes, condenses or changes from a gas to a solid, 80 cal/g, 600 cal/g and 680 cal/g are released to the environment respectively. The processes are all reversible.

The heat which is required to change the state of a substance from solid to liquid, or from liquid to gas, without change of temperature. The numerical value of the specific latent heat is the amount of heat required to change the state of unit mass. Most substances have a latent heat of fusion (melting) and a latent heat of evaporation. In thermodynamics, heat supplied at constant pressure is called enthalpy, and thus specific latent heat of evaporation is called enthalpy of evaporation.

(Qlat) is the heat content due to the presence of water vapor in the atmosphere. It is the heat that was required to evaporate the given amount of moisture.

the heat required for a phase change of a substance per unit mass.

Is the energy required to change a substance to a higher state of matter (solid liquid gas). This same energy is released from the substance when the change of state is reversed (gas liquid solid).

the amount of heat required to effect a change of state at the boiling or freezing points of a substance.

Heat required to change the state of a unit weight of a substance from solid to liquid or from liquid to vapor without change of temperature.

Latent Heat () is the quantity of heat absorbed or released when a substance changes its physical phase at constant temperature (e.g. from solid to liquid at the melting point or from liquid to gas at the boiling point).

Latent heat is a form of energy released by condensation or freezing of water. It results from the individual molecules releasing a small amount of energy as they drop to a less energetic state.

Thermal energy absorbed or released when a substance undergoes a phase change.

The amount of energy required to change a solid to a liquid or liquid to a gas.

Latent heat is the heat taken up (or released) when a substance melts (or solidifies). The uptake or release of latent heat does not change the temperature of the substance, it serves to change the state of the substance.

heat that is stored as water molecules evaporate and become water vapor. The heat is released when the water vapor condenses back to a liquid.

A change in the heat content that occurs without a corresponding change in temperature, usually accompanied by a change of state (as from liquid to vapor during evaporation).

the amount of heat given off when a substance changes form.

Energy stored when water evaporates or ice melts.

The heat released or absorbed per unit mass, at the same pressure and temperature, by a system in a reversible change of phase (e.g., water to water vapor by evaporation).

The quantity of heat absorbed or released by a substance undergoing a change of state, such as ice changing to water or water to steam, at constant temperature and pressure. When a solid material is heated and reaches its melting point, it goes from solid to liquid. During this process the material absorbs a certain amount of heat, Despite the heat input, the temperature of the material stays at a relatively constant level, even though phase change is taking place. We thus speak of latent (concealed) heat having been taken up by the material.

is the amount of energy absorbed or released during a phase-change process.

heat absorbed or radiated during a change of phase at a constant temperature and pressure

The heat that is stored in the objects and fixtures (for example walls, carpets, furniture, draperies) of a living space. To reduce the temperature of the room, the latent heat of the objects must be taken into account when calculating the cooling requirement of the space.

Heat that is absorbed or given off during a change of state of a material without changing its temperature.

the energy required for a substance to change state.

The heat required to change the state of a substance as in changing water to steam.

The quantity of heat absorbed or emitted, without change of temperature, during a change of state of unit mass of a material; it has normally been expressed in the unit cal/gm.

the heat energy that must be absorbed when a substance changes from solid to liquid and liquid to gas, and which is released when a gas condenses and a liquid solidifies.

The energy absorbed or released during a change of state.

the heat required to affect a phase transformation, e.g., latent heat of melting is the energy required to transform a solid to a liquid at constant temperature.

The energy of molecular separation and arrangement. It cannot be measured with a thermometer. Associated with change of state of a substance.

the heat given off or absorbed when a material melts or freezes, or boils or condenses. For example, when ice is heated, once the temperature reaches 0 oC, its temperature won't increase until all the ice is melted. The ice has to absorb heat in order to melt. But even though it's absorbing heat, its temperature stays the same until all the ice has melted. The heat required to melt the ice is called the latent heat. The water will give off the same amount of latent heat when you freeze it.

the heat (energy) absorbed or released as water changes between the gas (water vapor), the liquid (water droplets), and the solid (ice) states List of Glossary Terms

The quantity of heat absorbed or released by a substance undergoing a change of state, such as ice changing to water or water to steam, at constant temperature and pressure. It is called latent because it is not associated with a change in temperature.

A type of heat, which when added to or taken from a substance, does not change the temperature of the substance. Instead, the heat energy enables the substance to change its state.

The heat energy absorbed in the process of changing the state of a substance (eg. from solid to liquid, from liquid to gas, or vice versa) without changing the temperature or pressure.(Added: 12-Sep-1999 Rating: 5.00 Votes: 1)

The energy required to convert unit mass of a solid to liquid (or liquid to gas) at the same temperature; melting of ice, 80 cal g-1; vaporization of water, 540 cal g-1.

Heat energy absorbed or rejected when a substance is changing state and there is no change in temperature.

A type of heat that when added to an area produces an effect other than an increase in temperature.

the heat that does not change the temperature but does change the state of a substance when added to or removed from it.

The amount of heat needed to convert one pound of water to one pound of steam. Latent heat is expressed in BTU per pound.

Heat, that when added or removed, causes a change in state - but no change in temperature.

the heat released or absorbed by a substance during a phase change

The heat energy needed to change the state of a substance (i.e.: from a liquid to a gas) but not it's temperature.

This is the heat absorbed or released when a substance changes state without changing temperature.

The energy that is stored when water evaporates. This energy is released when water condenses as a liquid or ice.

Heat that changes the state of material from a solid to a liquid or a liquid to a gas.

Expressed in BTU per pound. The amount of heat needed (absorbed) to convert a pound of boiling water to a pound of steam.

Heat released or absorbed by a substance as it changes its state. When water vapour condenses into liquid, it releases this heat into the surrounding atmosphere. The atmosphere around this condensation then warms.

When a substance changes fri4om one state to another energy is either absorbed or liberated. This heat energy is called the Latent heat. The specific latent heat is the energy required to change the state of 1kg of the substance. The specific latent heat of fusion is the heat energy required to change 1 kg of material in the solid state at its melting point to 1kg of the material in its liquid state, and that released when 1kg of the liquid changed to 1kg of solid.

Energy required to vaporise liquid water without increasing its temperature.

The energy required to change a substance from one state to another. Heat of vaporization (Hv)= liquid to gas or gas to liquid. Heat of fusion (Hf) = solid to liquid or liquid to solid.

The quantity of energy that is absorbed or released as a substance undergoes a change of state, that is, as it changes from a solid to a liquid, or from a liquid to a gas, or from a liquid to a solid. There is no change in its temperature.

Heat energy absorbed in process of changing form of substance (melting, vaporisation, fusion) without change in temperature or pressure.

The heat either released or absorbed as a result of a change of state.

The amount of heat required for a change in physical state (phase change). The latent heat of vaporization is the amount of heat required to change a liquid into a vapor.

The heat absorbed or emitted without change of temperature during a change of state. heat is given out when water vapor condenses to form droplets and also when water freezes to form ice. Melting and evaporation absorb latent heat.

See HEAT, LATENT.

The amount of heat released or absorbed when a substance changes its physical phase with no change in temperature.

The energy released or absorbed during a change of state.

Heat that is used to change a condition, such as that need when a solid is turned into a liquid.

The change in heat content that occurs with a change in phase and without change in temperature.

Latent heat describes the amount of energy in the form of heat that is required for a material to undergo a change of phase (also known as "change of state"). This concept was introduced around 1750 by Joseph Black. Two latent heats are typically described.