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Pressure Variation in a Fluid at Rest01:11

Pressure Variation in a Fluid at Rest

250
In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in...
250
Surface Tension of Fluid01:22

Surface Tension of Fluid

279
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
279
Deriving the Speed of Sound in a Liquid01:09

Deriving the Speed of Sound in a Liquid

504
As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
The speed of sound in fluids can be derived by considering a mechanical wave...
504
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

181
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
181
Coriolis Force01:23

Coriolis Force

3.4K
An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression.
3.4K
Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

221
Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...
221

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相关实验视频

Updated: Jun 30, 2025

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
10:03

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel

Published on: October 5, 2018

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在液态水中相关的 libration.

David P Shelton1

  • 1Department of Physics and Astronomy, University of Nevada, Las Vegas, Nevada 89154-4002, USA.

The Journal of chemical physics
|March 21, 2024
PubMed
概括

研究人员使用超拉曼散射来分析液态水的 libracion光谱. 这项研究揭示了关于水的分子动力学和相关性的新细节.

科学领域:

  • 分子光谱学 分子光谱学
  • 物理化学 物理化学
  • 凝聚物质物理学 凝聚物质物理学

背景情况:

  • 由于其在自然和科学中无处不在的作用,了解液态水的动态是至关重要的.
  • 之前的研究已经探讨了水的振动和图解谱,但对图解模式的详细分析仍然具有挑战性.

研究的目的:

  • 通过先进的光谱技术来解析和描述液态H2O的升值光谱.
  • 研究分子间相互作用和相关性对水的 libration 动态的影响.

主要方法:

  • 利用超拉曼散射 (HRS) 的极化分析来探测液态H2O的 libra 频谱.
  • 分析了光谱特征,包括波段位置,分裂和强度差异,以推断分子相互作用和相关性.

主要成果:

  • 解析了 libra 频谱成八极扭曲带 (485 厘米-1) 和双极摇摆波段 (707,743 厘米-1).
  • 确定了负责带分裂的短距离 (<2 nm) 双极相互作用和方向相关性.
  • 观察到长距离 (> 200 纳米) libration 相关性影响频段强度差异,类似于冰 libration 模式.
  • 在36-54 fs. 之间确定 libration 放松时间.
  • 通过偏振分析检测出分子方向的远程相关性,阻碍转换,曲和拉伸振动.

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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相关实验视频

Last Updated: Jun 30, 2025

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals

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Magnetically Induced Rotating Rayleigh-Taylor Instability

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结论:

  • 该研究提供了液态水的 libration 频谱的详细表征,区分八极和二极模式.
  • 证明了短期和长期相关性在塑造水的 libration 动态中的重要作用.
  • 这些发现提供了对控制液态水结构和动态的复杂分子相互作用的见解.