Question

The latent heat of vaporization at critical point is

Answer 1

Answer:

zero.

Explanation:

In thermodynamics, a critical point (or critical state) is the end point of a phase equilibrium curve... The most prominent example is the liquid–vapor critical point, the end point of the pressure–temperature curve that designates conditions under which a liquid and its vapor can coexist.....

so as per critical point definition we can understand it is the point where liquid and vapour can coexist..

now latent heat of vaporization means the amount of heat needed to change liquid state to vapour state, but in critical point vapour state and liquid state are co exist . so we can say the latent heat of vaporization at critical point is zero.

other information: fluid over critical point is known as supercritical fluid.

Answer 2

Answer:

The latent heat of vaporization at the critical point is zero.

Explanation:

• At a critical point, the liquid exists directly transformed into vapor without having a two-phase transition. So, the enthalpy of vaporization at a critical point exists at zero.
• At a critical point, the latent heat of vaporization exists zero because at a critical point no energy exists needed to convert the liquid phase to the gaseous phase.
• vaporization, conversion of a substance from the liquid or solid stage into the gaseous (vapor) phase.

Therefore, The latent heat of vaporization at the critical point exists at zero.

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