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Related Concept Videos

Vaporization01:18

Vaporization

38.2K
The physical form of a substance changes by changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. For vaporization to occur, kinetic energy must be greater than the intermolecular forces that keep molecules bonded. The amount of energy needed to vaporize a quantity of liquid at a given pressure and a constant temperature is called the heat of vaporization. When...
38.2K
Vapor Pressure02:34

Vapor Pressure

40.9K
When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules move randomly about, they will occasionally collide with the surface of the condensed phase, and in some cases, these collisions will result in the molecules re-entering the condensed phase. The change from the gas phase to the liquid is called condensation. When the rate of condensation becomes equal to the rate of vaporization, neither the amount of the liquid nor the amount of the vapor...
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Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

21.5K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
21.5K
Vapor Pressure Lowering03:28

Vapor Pressure Lowering

31.3K
The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
31.3K
Free Energy01:21

Free Energy

52.1K
Free energy—abbreviated as G for the scientist Gibbs who discovered it—is a measurement of useful energy that can be extracted from a reaction to do work. It is the energy in a chemical reaction that is available after entropy is accounted for. Reactions that take in energy are considered endergonic and reactions that release energy are exergonic. Plants carry out endergonic reactions by taking in sunlight and carbon dioxide to produce glucose and oxygen. Animals, in turn, break...
52.1K
Limiting Reactant02:27

Limiting Reactant

70.1K
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in reality, the reactants are not always present in the stoichiometric amounts indicated by the balanced equation.
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Related Experiment Video

Updated: Feb 6, 2026

Experimental System of Solar Adsorption Refrigeration with Concentrated Collector
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Cold Vapor Generation beyond the Input Solar Energy Limit.

Haomin Song1, Youhai Liu1, Zhejun Liu2

  • 1Department of Electrical Engineering The State University of New York at Buffalo Buffalo NY 14260 USA.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|August 22, 2018
PubMed
Summary

Researchers achieved near-perfect solar vapor generation efficiency, surpassing theoretical limits by utilizing environmental heat. This breakthrough in solar energy conversion offers a novel approach to efficient water production.

Keywords:
cold vapor generationperfect energy conversionsolar stillsolar–thermal conversionwater purification

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Area of Science:

  • Energy harvesting and conversion
  • Materials science
  • Thermodynamics

Background:

  • The pursuit of 100% efficiency in energy conversion is a long-standing goal.
  • Previous energy conversion processes have not reached this ideal limit.
  • Solar vapor generation is a promising technology for water production and energy harvesting.

Purpose of the Study:

  • To demonstrate a solar vapor generation system with near-perfect energy conversion efficiency.
  • To investigate vapor generation rates exceeding the theoretical limit imposed by solar input.
  • To validate a novel strategy using ambient heat for enhanced solar vapor generation.

Main Methods:

  • Experimental setup for solar vapor generation below room temperature.
  • Utilizing low-density solar illumination (1 sun).
  • Measuring vapor generation rates and comparing them to theoretical limits and ambient conditions.

Main Results:

  • Achieved near-perfect energy conversion efficiency in solar vapor generation.
  • Observed vapor generation rates exceeding the upper limit dictated by solar energy input.
  • Measured a peak vapor generation rate of approximately 2.20 kg m⁻² h⁻¹ under 1 sun illumination.
  • This rate surpassed the theoretical limit of 1.68 kg m⁻² h⁻¹ and outperformed other systems under higher solar intensity (2 suns).

Conclusions:

  • A novel strategy for enhanced solar vapor generation by leveraging ambient thermal energy was successfully demonstrated.
  • The system operates efficiently even under low solar illumination, achieving rates beyond theoretical solar energy limits.
  • This research opens new avenues for highly efficient solar energy conversion and water production technologies.