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Related Concept Videos

Superconductor01:24

Superconductor

A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
Thermal Expansion01:22

Thermal Expansion

The expansion of alcohol in a thermometer is one of many commonly encountered examples of thermal expansion, which is the change in size or volume of a given system as its temperature changes. The most visible example is the expansion of hot air. When air is heated, it expands and becomes less dense than the surrounding air, which then exerts an upward force on the hot air to, for example, make steam and smoke rise, and hot air balloons float. The same behavior happens in all liquids and gases,...
Electrical Conductivity01:13

Electrical Conductivity

In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Resistivity01:22

Resistivity

When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
Weir: Problem Solving01:26

Weir: Problem Solving

Water flow in open channels is often measured using hydraulic structures such as weirs, which allow precise calculation of discharge. In a rectangular channel, flow rates are measured using three types of weirs: rectangular sharp-crested, triangular sharp-crested, and broad-crested. The weir head is set at a fixed height above the channel bottom, simplifying calculations and enabling the relationship between depth and flow rate to be analyzed.For the rectangular sharp-crested weir, the flow...

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Related Experiment Video

Updated: May 28, 2026

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
08:52

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

Thermal conductivity minimum: a new water anomaly.

Pradeep Kumar1, H Eugene Stanley

  • 1Center for Studies in Physics and Biology, 1230 York Avenue, Rockefeller University, New York, New York 10021, USA.

The Journal of Physical Chemistry. B
|October 15, 2011
PubMed
Summary
This summary is machine-generated.

Computer simulations reveal liquid water

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Last Updated: May 28, 2026

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere
08:52

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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Thermal Measurement Techniques in Analytical Microfluidic Devices
08:29

Thermal Measurement Techniques in Analytical Microfluidic Devices

Published on: June 3, 2015

Area of Science:

  • Physical Chemistry
  • Computational Fluid Dynamics

Background:

  • Thermal conductivity is a key property of liquids.
  • Water exhibits anomalous behavior in its physical properties.

Purpose of the Study:

  • To investigate the thermal conductivity of liquid water using computer simulations.
  • To explore the low-temperature behavior of water's thermal conductivity.

Main Methods:

  • Utilized computer simulations with the TIP5P water model.
  • Analyzed thermal conductivity across a range of temperatures, focusing on low temperatures.

Main Results:

  • Observed a minimum in thermal conductivity at low temperatures, in addition to the known high-temperature maximum.
  • Found that the temperature of minimum thermal conductivity aligns with the temperature of maximum specific heat in supercooled water.
  • Linked these findings to structural rearrangements in liquid water.

Conclusions:

  • The TIP5P model accurately reproduces experimental thermal conductivity behavior.
  • Supercooled water exhibits a minimum in thermal conductivity, correlating with specific heat anomalies.
  • Structural changes are crucial for understanding water's thermal properties at low temperatures.