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States of Water01:23

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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.
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Quality of Water01:19

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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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Testing Water Quality01:14

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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...
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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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Shallow Water Paddling Variants of Water Maze Tests in Mice
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Exploring water's no-man's land.

Peter Lunkenheimer1, Daniel Reuter1, Arthur Schulz1

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

Physical Review. E
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Summary
This summary is machine-generated.

Researchers explored water's supercooled state using dielectric spectroscopy and calorimetry. They found evidence of a liquid crossover in water, impacting its glass transition and molecular dynamics.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biophysics

Background:

  • Water exhibits complex behavior in its supercooled state, including a hypothesized liquid-liquid transition.
  • Crystallization in the "no-man's land" region hinders the study of supercooled water's properties.
  • Understanding water's transitions is crucial for various scientific disciplines.

Purpose of the Study:

  • To investigate the glass transition and potential liquid-liquid transition in supercooled water.
  • To overcome crystallization challenges using aqueous LiCl solutions and broad frequency measurements.
  • To identify changes in water's molecular dynamics and liquid fragility.

Main Methods:

  • Dielectric spectroscopy measurements across an exceptionally broad frequency range (up to THz).
  • Calorimetry measurements on pure water and aqueous LiCl solutions.
  • Quenching techniques applied to LiCl solutions to prevent crystallization.

Main Results:

  • Evidence of a crossover in water from a strong to a fragile liquid state was observed.
  • Distinct glass-transition temperatures were identified for different liquid states.
  • Non-Arrhenius temperature dependencies in molecular dynamics were characterized.

Conclusions:

  • The study provides strong hints for a liquid crossover in supercooled water.
  • The findings offer new insights into the complex dynamics of water.
  • This research contributes to understanding water's anomalous properties.