What is latent heat also referred to as?
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What is latent heat also referred to as?
Latent heat (also known as latent energy or heat of transformation) is energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process — usually a first-order phase transition.
Latent heat can be understood as energy in hidden form which is supplied or extracted to change the state of a substance without changing its temperature.
What is hidden heat or latent heat discuss and elaborate?
So the substance was gaining energy but it was “hidden” from observers because the temperature was not rising. That is why they called the heat they transferred to the substance during phase changes “latent heat” (i.e. hidden heat).
Why does latent heat exist?
latent heat, energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature. The process of dissolving one substance in another often involves heat; if the solution process is a strictly physical change, the heat is a latent heat. …
Can latent heat negative?
A negative latent heat flux means water is evaporating from the surface. A positive sensible heat flux means heat is flowing from the atmosphere to the surface. A negative sensible heat flux means heat is flowing from the surface to the atmosphere.
Why are the latent heat of fusion and the latent heat of vaporization said to be hidden? a. Molecular potential energy is increased as water vapor is condensed or water freezes. Heat is absorbed or released, but a temperature change does not take place, so they are “hidden.”
What is meant by latent heat explain the role of latent heat in the change of state of a substance?
During the phase change of a substance, its temperature does not increase and hence its kinetic energy. Thus, the heat supplied during phase transformation is used up in increasing or decreasing the potential energy and this heat energy is known as latent heat.
Why latent heat of vaporization is greater than latent heat of fusion?
The latent heat of vaporization is higher than the latent heat of fusion since gas molecules have the largest intermolecular space and the force of attraction between the molecules is almost negligible. Therefore, more energy is required to convert liquid to gas.
Why is latent heat always positive?
Latent heat of condensation is equal to the latent heat of vapourization with opposite sign. The latent heat of condensation is always negative since heat is released by the substance whereas latent heat of vaporization is always positive since heat is absorbed by the substance.
What does a negative latent heat mean?
On one of the questions in NS 5, you were required to know that a negative latent heat meant that you are having an energy consuming phase change (for example, evaporation or sublimation).