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States of Water01:23

States of Water

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Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
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Water and Mineral Acquisition02:34

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Specialized tissues in plant roots have evolved to capture water, minerals, and some ions from the soil. Roots exhibit a variety of branching patterns that facilitate this process. The outermost root cells have specialized structures called root hairs that increase the root surface, thus increasing soil contact. Water can passively cross into roots, as the concentration of water in the soil is higher than that of the root tissue. Minerals, in contrast, are actively transported into root cells.
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Quality of Water01:19

Quality of Water

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In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
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The Water Cycle01:00

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The Earth’s hydrosphere includes all of the areas where the storage and movement of water occurs. Since water is the basis of all living processes, the cycling of water is extremely important to ecosystem dynamics.
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Effect of Sea Water on Concrete01:22

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Concrete exposed to seawater can undergo degradation like the dissolution of ettringite and gypsum, increasing the material's porosity and decreasing its strength. In contrast, the crystallization of salts within the concrete's pores can cause expansion, particularly above the waterline where evaporation occurs. Nonetheless, this expansion only happens when seawater, enabled by the concrete's permeability, manages to infiltrate the structure.
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Regulation of Water Intake01:25

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Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
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Updated: Jan 23, 2026

In Situ Characterization of Boehmite Particles in Water Using Liquid SEM
11:59

In Situ Characterization of Boehmite Particles in Water Using Liquid SEM

Published on: September 27, 2017

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Is water one liquid or two?

A K Soper1

  • 1ISIS Facility, UKRI-STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom.

The Journal of Chemical Physics
|June 24, 2019
PubMed
Summary
This summary is machine-generated.

This study analyzes water's structure, finding density fluctuations are too small for distinct high and low-density states. Water does not exhibit two-phase behavior, challenging existing theories.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Statistical Mechanics

Background:

  • The concept of water existing as a mixture of two distinct states (high-density and low-density) is a topic of ongoing research.
  • Understanding water's anomalous properties, such as its negative thermal expansion, is crucial in various scientific fields.

Purpose of the Study:

  • To analyze the validity of the two-state model for water.
  • To investigate the density fluctuations and entropy of water across different phases and conditions.
  • To determine if water exhibits two-phase behavior based on density and entropy distributions.

Main Methods:

  • Analysis of water's compressibility and density fluctuations at the nanoscale (1 nm³).
  • Utilizing neutron and X-ray scattering data with empirical potential structure refinement simulations.
  • Calculating configurational entropy via spherical harmonic reconstruction of orientational pair correlation functions.

Main Results:

  • Density fluctuations in water are too small (≈4%) to support significant high- and low-density regions.
  • Simulations indicate water is in a one-phase region, not a two-phase region, across explored liquid and amorphous states.
  • Entropy calculations show a declining trend with decreasing temperature and do not support distinct high-entropy/low-entropy states coexisting.

Conclusions:

  • The hypothesis of water as a mixture of two distinct states is not supported by the analyzed data.
  • Water's behavior is better described as a single phase, with density fluctuations insufficient for a clear two-state distinction.
  • While temperature influences entropy, high-density water does not possess significantly higher entropy than low-density water at ambient conditions.