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相关概念视频

States of Water01:23

States of Water

53.7K
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...
53.7K
Water and Mineral Acquisition02:34

Water and Mineral Acquisition

33.7K
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.
33.7K
Body Water Content and Fluid Compartments01:19

Body Water Content and Fluid Compartments

1.9K
Life's biochemical processes occur within aqueous solutions. Solutes are substances that are dissolved within these solutions. The human body contains a variety of solutes, which can differ across various body parts. These can encompass proteins—such as those responsible for clotting and carbohydrate transport—as well as electrolytes. In medicine, an electrolyte is often described as a mineral ion derived from a salt possessing an electric charge. Examples include sodium ions...
1.9K
Quality of Water01:19

Quality of Water

191
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...
191
Testing Water Quality01:14

Testing Water Quality

187
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
187
Buoyancy00:59

Buoyancy

10.6K
When an object is placed in a fluid, it either floats or sinks. All objects in a fluid experience a buoyant force. For example, a metal ball sinks, while a rubber ball floats. Similarly, a submarine can sink and float by adjusting its buoyancy.  The concept of buoyancy raises several interesting questions. For instance, where does this buoyant force come from? How much buoyant force is required to make an object sink or float? Do objects that sink get any support at all from the...
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相关实验视频

Updated: Sep 13, 2025

Shallow Water Paddling Variants of Water Maze Tests in Mice
07:47

Shallow Water Paddling Variants of Water Maze Tests in Mice

Published on: June 3, 2013

23.7K

探索水的无人的土地.

Peter Lunkenheimer1, Daniel Reuter1, Arthur Schulz1

  • 1University of Augsburg, Experimental Physics V, Center for Electronic Correlations and Magnetism, 86159 Augsburg, Germany.

Physical review. E
|August 1, 2025
PubMed
概括
此摘要是机器生成的。

研究人员使用介电光谱和热量计来探索水的超冷状态. 他们发现了水中液体交叉的证据,影响了其玻璃过渡和分子动力学.

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Morris Water Maze Experiment
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Morris Water Maze Experiment

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Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
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Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions

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相关实验视频

Last Updated: Sep 13, 2025

Shallow Water Paddling Variants of Water Maze Tests in Mice
07:47

Shallow Water Paddling Variants of Water Maze Tests in Mice

Published on: June 3, 2013

23.7K
Morris Water Maze Experiment
04:45

Morris Water Maze Experiment

Published on: September 24, 2008

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Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
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科学领域:

  • 物理化学 物理化学
  • 材料科学 材料科学 材料科学
  • 生物物理学的生物物理.

背景情况:

  • 水在超冷状态下表现出复杂的行为,包括一个假设的液体-液体过渡.
  • 在"无人之地"地区的结晶阻碍了对超冷水特性的研究.
  • 了解水的转变对于各种科学学科至关重要.

研究的目的:

  • 为了研究超冷水中的玻璃过渡和潜在的液体-液体过渡.
  • 为了克服结晶的挑战,使用水性LiCl溶液和广频测量.
  • 为了识别水的分子动力学和液体脆弱性的变化.

主要方法:

  • 介电光谱测量在一个非常宽的频率范围 (高达THz).
  • 对纯水和水性LiCl溶液进行热量测量测量.
  • 用于防止结晶的LiCl溶液的火技术.

主要成果:

  • 观察到证据表明,水从强的液态转变为脆弱的液态.
  • 对于不同的液态,确定了不同的玻璃过渡温度.
  • 在分子动力学中表征了非阿雷尼乌斯温度依赖性.

结论:

  • 这项研究为超冷水中的液体交叉提供了强有力的线索.
  • 这些发现为水的复杂动态提供了新的见解.
  • 这项研究有助于理解水的异常性质.