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Related Concept Videos

Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Isothermal Processes01:21

Isothermal Processes

4.7K
A thermodynamic process that occurs at constant temperature is called an isothermal process. Heat slowly flows into the system or out of the system to maintain thermal equilibrium. Processes involving phase changes like water evaporation into steam or freezing water into ice at a constant temperature are examples of Isothermal Processes.
An ideal gas can also undergo isothermal expansion or compression.
For example, consider 1 mole of an ideal gas inside an isolated cylinder at initial volume V...
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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
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Joule-Thomson Effect01:21

Joule-Thomson Effect

8.8K
The Joule-Thomson effect, also known as the Joule-Kelvin effect, describes the temperature change of a fluid when it is forced through a valve or porous plug while keeping it in a thermally insulated environment. This experiment is called a throttling process. This is an important effect widely used in refrigeration and the liquefaction of gases.
This experiment forces high-pressure gas through a throttle valve or a porous plug to a lower-pressure region. The gas expands as it passes through to...
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Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

9.0K
Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
9.0K
Effects of Temperature on Free Energy02:11

Effects of Temperature on Free Energy

27.9K
The spontaneity of a process depends upon the temperature of the system. Phase transitions, for example, will proceed spontaneously in one direction or the other depending upon the temperature of the substance in question. Likewise, some chemical reactions can also exhibit temperature-dependent spontaneities. To illustrate this concept, the equation relating free energy change to the enthalpy and entropy changes for the process is considered:
27.9K

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Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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Solar Wind Temperature Isotropy.

P H Yoon1,2,3, J Seough3, C S Salem4

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Scientists explain the solar wind

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Area of Science:

  • Space Physics and Astronomy
  • Plasma Physics

Background:

  • Accurate solar wind models are crucial for understanding near-Earth space conditions and missions like NASA's Parker Solar Probe.
  • A key unexplained phenomenon is the quasi-isotropy of solar wind temperatures observed near 1 AU, contradicting theoretical predictions of inequality.

Purpose of the Study:

  • To investigate the mechanisms responsible for the observed solar wind temperature quasi-isotropy.
  • To provide a theoretical explanation for why proton and electron temperatures appear isotropic despite theoretical predictions of anisotropy.

Main Methods:

  • Theoretical analysis focusing on the dynamical coupling between electrons and protons.
  • Inclusion of collisional processes and plasma instabilities in the modeling approach.

Main Results:

  • The study demonstrates that dynamical coupling significantly influences temperature distributions.
  • Collisional processes and instabilities contribute to reducing temperature anisotropies.

Conclusions:

  • Dynamical coupling of electrons and protons offers a potential resolution to the solar wind temperature isotropy problem.
  • This finding enhances our understanding of solar wind physics relevant to in-situ observations and space missions.