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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

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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...
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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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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Masonry in Cold and Hot Weather Conditions01:21

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In cold weather, masonry construction requires specific precautions to ensure mortar does not freeze before curing, as this can significantly weaken its strength and watertightness. Mortar temperature should be maintained between 60°F and 80°F to support proper hydration and curing. Below 40°F, mortar water must be heated, but should not exceed 120°F as high temperatures can reduce mortar's compressive and bond strength.
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Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
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The moisture content of aggregates is a crucial factor in construction, particularly in concrete mixing, as it influences the total water required in the mix. Moisture content represents the water coated on the exterior surface of the aggregate existing in a saturated and surface-dry condition. The total water content of a moist aggregate is the sum of its moisture content and water absorption.
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Related Experiment Video

Updated: Dec 11, 2025

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface
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Dry soils can intensify mesoscale convective systems.

Cornelia Klein1,2, Christopher M Taylor3,4

  • 1UK Centre for Ecology and Hydrology, Wallingford OX10 8BB, United Kingdom; cornkle@ceh.ac.uk.

Proceedings of the National Academy of Sciences of the United States of America
|August 21, 2020
PubMed
Summary

Drier soils enhance rainfall from mesoscale convective systems (MCSs), particularly in the Sahel. This soil moisture feedback strengthens organized convection, impacting severe weather prediction.

Keywords:
dry linemesoscale convective systemspropagating convectionsoil moisture

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Area of Science:

  • Atmospheric Science
  • Meteorology
  • Climate Science

Background:

  • Soil moisture influences rainfall by affecting surface fluxes and convection development.
  • Previous research primarily focused on convection initiation, neglecting remote triggering by mesoscale convective systems (MCSs).
  • Most global rainfall originates from remotely triggered MCSs, highlighting a gap in understanding soil moisture impacts on mature storms.

Purpose of the Study:

  • To analyze observational data on soil moisture feedbacks affecting propagating MCSs globally.
  • To investigate the specific impact of soil moisture on convection within mature MCSs.
  • To explore the mechanisms and implications of soil moisture-driven convection intensification.

Main Methods:

  • Systematic observational analysis of soil moisture feedbacks on MCSs worldwide.
  • Utilized satellite imagery of thousands of storms over the Sahel.
  • Statistical analysis of convective core formation relative to dry soil patch locations and sizes.

Main Results:

  • Drier soils show a significant positive impact on convection within mature MCSs.
  • Convective cores in Sahelian MCSs are favored downstream of dry patches (≥200 km).
  • Dry soils intensify MCSs by enhancing convergence, instability, and wind shear, particularly during the afternoon-evening peak.

Conclusions:

  • Soil moisture significantly modulates convection in mature MCSs, especially in the Sahel.
  • Dry soil conditions contribute to an additional 20% of convective cores during peak diurnal activity.
  • Findings link dry line dynamics to soil moisture, with implications for severe weather nowcasting in MCS hotspot regions.