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Vaporization

Vaporization

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...

Vapor Pressure Lowering

Vapor Pressure Lowering

The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates: Dissolving a nonvolatile substance in volatile liquid results in a lowering of the liquid’s vapor pressure. This phenomenon can be explained by considering the effect of added solute molecules on the liquid's vaporization and condensation processes. To vaporize, solvent molecules must be present at the surface of the solution. The presence of...

Phase Transitions: Vaporization and Condensation

Phase Transitions: Vaporization and Condensation

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...

Gas Chromatography: Sample Injection Systems

Gas Chromatography: Sample Injection Systems

In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
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Precipitation Processes

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...

Vapor Pressure

Vapor Pressure

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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Related Experiment Video

Updated: Jul 12, 2026

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

Published on: June 8, 2015

Water vapor: stratospheric injection by thunderstorms.

P M Kuhn, M S Lojko, E V Petersen

Science (New York, N.Y.)

|December 24, 1971

Summary

Plains thunderstorms significantly increase lower stratosphere and upper troposphere water vapor. Airborne measurements revealed a threefold rise in water vapor mass compared to fair weather conditions.

Area of Science:

Atmospheric science
Cloud physics
Radiometry

Background:

Thunderstorms inject significant moisture into the atmosphere.
Understanding water vapor transport is crucial for climate modeling.

Purpose of the Study:

To quantify the mass of water vapor injected by plains thunderstorms into the lower stratosphere and upper troposphere.
To compare thunderstorm-influenced water vapor levels with fair weather background levels.

Main Methods:

Airborne infrared radiometric inference measurements were utilized.
Data was collected using the National Aeronautics and Space Administration (NASA) Convair 990 jet laboratory.
A large sample size was achieved, exceeding the capabilities of traditional balloon techniques.

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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Published on: April 21, 2017

Related Experiment Videos

Last Updated: Jul 12, 2026

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

Published on: June 8, 2015

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Published on: April 21, 2017

Main Results:

A threefold average increase in water vapor mass was observed in the lower stratosphere and upper troposphere following thunderstorm activity.
Measurements confirmed substantial water vapor injection by plains thunderstorms.

Conclusions:

Plains thunderstorms are a major source of water vapor in the upper troposphere and lower stratosphere.
Airborne radiometric measurements provide a robust method for studying atmospheric water vapor dynamics.