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相关概念视频

States of Water01:23

States of Water

56.8K
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...
56.8K
The Water Cycle01:00

The Water Cycle

28.5K
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.
28.5K
Water and Mineral Acquisition02:34

Water and Mineral Acquisition

35.7K
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.
35.7K
Quality of Water01:19

Quality of Water

561
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...
561
Water: A Bronsted-Lowry Acid and Base02:30

Water: A Bronsted-Lowry Acid and Base

58.7K
The reaction between a Brønsted-Lowry acid and water is called acid ionization. For example, when hydrogen fluoride dissolves in water and ionizes, protons are transferred from hydrogen fluoride molecules to water molecules, yielding hydronium ions and fluoride ions:
58.7K
Regulation of Water Intake01:25

Regulation of Water Intake

2.8K
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...
2.8K

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相关实验视频

Updated: Feb 2, 2026

In Situ Characterization of Boehmite Particles in Water Using Liquid SEM
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In Situ Characterization of Boehmite Particles in Water Using Liquid SEM

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水是一种状液体

Tomaz Urbic1, Ken A Dill2

  • 1Faculty of Chemistry and Chemical Technology , University of Ljubljana , Večna pot 113 , Ljubljana SI-1000 , Slovenia.

Journal of the American Chemical Society
|November 22, 2018
PubMed
概括

一个新的统计机械模型揭示了水的键 (HB) 和莱纳德-斯 (LJ) 相互作用如何决定其物理性质. 这种分析模型准确地预测了水的行为,

科学领域:

  • 物理化学
  • 统计力学
  • 凝聚物质物理学

背景情况:

  • 液态水的物理性质仍然不完全理解.
  • 现有的模型难以完全解释水的异常行为和结构属性关系.

研究的目的:

  • 开发液态水的预测统计机械模型.
  • 阐明水的能量,体积和异常性质的分子机制.
  • 挑战水结构的"二密度液体"模式.

主要方法:

  • 分析CageWater模型的介绍.
  • 包括结合 (HB) 和莱纳德-斯 (LJ) 相互作用.
  • 对已知的能量,体积和异常水性质进行验证.

主要成果:

  • 水模型准确地预测了水的物理性质.
  • 发现了一种新的对抗性:水-水对HBs增加密度,而合作HBs增加开放性.
  • 证明了这种平衡的温度和压力依赖性,解释了超冷水的液态-液态相变.

结论:

  • 水模型为了解液态水提供了一个计算效率高,准确的框架.

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  • 揭示了水的结构属性关系的新分子基础,与"二密度液体"概念不同.
  • 在地球物理学,生物分子建模和材料科学等领域的潜在应用.