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May 22, 2019 · Latent heat is the amount of heat added to or removed from a substance to produce a change in phase. During vaporisation, this energy breaks down the intermolecular attractive forces, and also must provide the energy necessary to expand the gas (the pΔV work ). When latent heat is added or removed, no temperature change occurs.
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. It is an important component of Earth's surface energy budget.
The molar heat of condensation \(\left( \Delta H_\text{cond} \right)\) is the heat released by one mole of a substance as it is converted from a gas to a liquid. Examples of calculations involving the molar heat of vaporization and condensation are illustrated.
Apr 19, 2023 · Latent heat of condensation. When a gas condenses into a liquid, it releases energy in the form of heat, and this energy is referred to as latent heat of condensation. When water vapour is cooled, it loses energy and the molecules begin to slow down.
Because this energy enters or leaves a system during a phase change without causing a temperature change in the system, it is known as latent heat (latent means hidden). The three phases of matter that you frequently encounter are solid, liquid and gas (see Figure 11.8 ).
The heat Q required to change the phase of a sample of mass m is given by \(\mathrm{Q=mL_f}\) (melting or freezing) and \(\mathrm{Q=mL_v}\) (evaporating or condensing), where \(\mathrm{L_f}\) and \(\mathrm{L_v}\) are the latent heat of fusion and the latent heat of vaporization, respectively.
Jul 11, 2021 · The heat \(Q\) required to change the phase of a sample of mass \(m\) is given by \[ Q = mL_f (melting/freezing),\] \[Q = mL_v (vaporization/condensation),\] where the latent heat of fusion, \(L_f\), and latent heat of vaporization, \(L_v\), are material constants that are determined experimentally.
If there is a temperature change, the transferred heat depends on the specific heat (see Table 14.1) whereas, for a phase change, the transferred heat depends on the latent heat. See Table 14.2.
Jun 5, 2024 · To calculate latent heat, you need to multiply two numbers: Specific latent heat, the energy absorbed or released during a phase transition per kilogram of substance; and; The mass of the substance. latent heat = specific latent heat × mass
This energy is released when the water vapor subsequently condenses, where it is called the latent heat of condensation. As before, water vapor at 0°C has 2501 J g −1 more energy than liquid water at 0°C.
