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The latent heat of fusion is the amount of heat needed to cause a phase change between solid and liquid. The latent heat of vaporization is the amount of heat needed to cause a phase change between liquid and gas.
- 14.3 Phase Change and Latent Heat - College Physics 2e - OpenStax
If there is a temperature change, the transferred heat...
- 14.3 Phase Change and Latent Heat - College Physics 2e - OpenStax
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.
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 . Substitute the knowns along with their units into the appropriate equation and obtain numerical solutions complete with units.
There is no temperature change until a phase change is complete. Latent heat is measured in units of J/kg. Both Lf and Lv depend on the substance, particularly on the strength of its molecular forces as noted earlier. Lf and Lv are collectively called latent heat coefficients.
There is no temperature change until a phase change is complete. Latent heat is measured in units of J/kg.
27 Μαΐ 2024 · Mathematical Representation of Latent Heat. The energy change, \( Q \), during a phase change is given by the formula: \[ Q = m \times L \] Where: \( m \) is the mass of the substance. \( L \) is the specific latent heat (either of fusion or vaporization).
