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Related Concept Videos

Vaporization01:18

Vaporization

38.0K
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...
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Vapor Pressure02:34

Vapor Pressure

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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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Vapor Pressure Lowering03:28

Vapor Pressure Lowering

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The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
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Precipitation Reactions03:10

Precipitation Reactions

65.3K
In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
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Precipitation of Ions03:11

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

4.3K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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Related Experiment Video

Updated: Jan 29, 2026

Author Spotlight: Exploring Cellular Processes by Modeling Ligands in Cryo-EM Maps
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A New Method for Refining the GNSS-Derived Precipitable Water Vapor Map.

Chen Liu1,2, Nanshan Zheng3,4, Kefei Zhang5,6

  • 1Jiangsu Key Laboratory of Resources and Environmental Information Engineering, China University of Mining and Technology, Xuzhou 221116, China. lcddhr@cumt.edu.cn.

Sensors (Basel, Switzerland)
|February 13, 2019
PubMed
Summary

A new interpolation method, the LZ method, enhances Global Navigation Satellite System (GNSS)-derived precipitable water vapor (PWV) maps by increasing sample density. This refined method offers improved detail and prediction accuracy compared to conventional approaches.

Keywords:
GNSS remote sensingdigital elevation modelprecipitable water vaporweighted mean temperature

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Area of Science:

  • Geodesy and Geophysics
  • Atmospheric Science
  • Remote Sensing

Background:

  • Precipitable Water Vapor (PWV) is crucial for atmospheric studies.
  • Global Navigation Satellite System (GNSS) data offers a valuable source for PWV estimation.
  • Existing interpolation methods for GNSS-derived PWV maps have limitations in detail and accuracy.

Purpose of the Study:

  • To introduce and validate the LZ method for refining GNSS-derived PWV maps.
  • To improve the spatial resolution and accuracy of PWV mapping.
  • To compare the LZ method against conventional interpolation techniques.

Main Methods:

  • Development of a regional weighted mean temperature (Tm) model.
  • Generation of virtual sample points using Digital Elevation Model (DEM) data based on PWV correlations.
  • Implementation of the LZ interpolation method utilizing virtual sample points.
  • Validation through comparison with conventional interpolation methods using cross-validation.

Main Results:

  • The LZ method produced GNSS-derived PWV maps with significantly more spatial detail than conventional methods.
  • Cross-validation demonstrated superior prediction performance for the LZ method.
  • The regional Tm model introduced minor variations in PWV compared to previous models.

Conclusions:

  • The LZ method effectively refines GNSS-derived PWV maps by incorporating virtual sample points.
  • The LZ method offers enhanced detail and prediction accuracy for PWV mapping.
  • This approach contributes to more precise atmospheric water vapor monitoring.