Curie temperature

Examples of Curie temperature in the following topics:

• Ferromagnets and Electromagnets

  • Increased thermal motion at higher temperature can disrupt and randomize the orientation and the size of the domains.
  • There is a well-defined temperature for ferromagnetic materials called the Curie temperature, above which they cannot be magnetized.
  • The Curie temperature for iron is well above room temperature at 1043 K (770ºC).
  • Several elements and alloys have Curie temperatures much lower than room temperature, and are ferromagnetic only below those temperatures.

• Dependence of Resistance on Temperature

  • Resistivity and resistance depend on temperature with the dependence being linear for small temperature changes and nonlinear for large.
  • The resistivity of all materials depends on temperature.
  • The temperature coefficient is typically +3×10−3 K−1 to +6×10−3 K−1 for metals near room temperature.
  • Above that critical temperature, its resistance makes a sudden jump and then increases nearly linearly with temperature.
  • Compare temperature dependence of resistivity and resistance for large and small temperature changes

• Absolute Temperature

  • Absolute temperature is the most commoly used thermodyanmic temperature unit and is the standard unit of temperature.
  • Thermodynamic temperature is the absolute measure of temperature.
  • Thermodynamic temperature is an "absolute" scale because it is the measure of the fundamental property underlying temperature: its null or zero point ("absolute zero") is the temperature at which the particle constituents of matter have minimal motion and cannot become any colder.
  • By using the absolute temperature scale (Kelvin system), which is the most commonly used thermodynamic temperature, we have shown that the average translational kinetic energy (KE) of a particle in a gas has a simple relationship to the temperature:
  • The kelvin (or "absolute temperature") is the standard thermodyanmic temperature unit.

• Blackbody Temperatures

  • A blackbody is of course characterized by a single temperature, $T$.
  • There are three characteristic temperatures in common usage: brightness temperature, effective temperature and the colour temperature.
  • The brightness temperature is determined by equating the brightness or intensity of an astrophysical source to the intensity of a blackbody and solving for the temperature of the corresponding blackbody.
  • In what regime does the linear relationship between the brightness temperature and the intensity begin to fail?
  • Finally the effective temperature is the temperature of a blackbody that emits the same flux at its surface as the source, i.e.

• Blackbody Radiation

  • A blackbody is of course characterized by a single temperature, $T$.
  • There are three characteristic temperatures in common usage: brightness temperature, effective temperature and the colour temperature.
  • The brightness temperature has several nice properties.
  • The colour temperature is defined by looking at the peak of the emission from the source and using Wien's displacement law to define a corresponding temperature.
  • Finally the effective temperature is the temperature of a blackbody that emits the same flux at its surface as the source, i.e.

• Absolute Zero

  • Absolute zero is the coldest possible temperature; formally, it is the temperature at which entropy reaches its minimum value.
  • Absolute zerois the coldest possible temperature.
  • Formally, it is the temperature at which entropy reaches its minimum value.
  • Therefore, it is a natural choice as the null point for a temperature unit system.
  • A brief introduction to temperature and temperature scales for students studying thermal physics or thermodynamics.

• Thermodynamics

  • A blackbody is of course characterized by a single temperature, $T$.
  • There are three characteristic temperatures in common usage: brightness temperature, effective temperature and the colour temperature.
  • The brightness temperature is determined by equating the brightness or intensity of an astrophysical source to the intensity of a blackbody and solving for the temperature of the corresponding blackbody.
  • In what regime does the linear relationship between the brightness temperature and the intensity begin to fail?
  • Finally the effective temperature is the temperature of a blackbody that emits the same flux at its surface as the source, i.e.

• A Review of the Zeroth Law

  • Zeroth law justifies the use of thermodynamic temperature, defined as the shared temperature of three designated systems at equilibrium.
  • Zeroth law justifies the use of thermodynamic temperature : the common "label" that the three systems in the definition above share is defined as the temperature of the systems.
  • Thermometers actually take their own temperature, not the temperature of the object they are measuring.
  • The systems interact and change because their temperatures differ, and the changes stop once their temperatures are the same.
  • Discuss how the Zeroth Law of Thermodynamics justifies the use of thermodynamic temperature

• Kelvin Scale

  • The kelvin is a unit of measurement for temperature; the null point of the Kelvin scale is absolute zero, the lowest possible temperature.
  • The kelvin is a unit of measurement for temperature.
  • The Kelvin scale is an absolute, thermodynamic temperature scale using absolute zero as its null point.
  • A brief introduction to temperature and temperature scales for students studying thermal physics or thermodynamics.
  • Relationships between the Fahrenheit, Celsius, and Kelvin temperature scales, rounded to the nearest degree.

• Celsius Scale

  • Celsius, or centigrade, is a scale and unit of measurement for temperature.
  • It is one of the most commonly used temperature units.
  • Absolute zero, the lowest temperature possible (the temperature at which matter reaches minimum entropy), is defined as being precisely 0K and -273.15°C.
  • Besides expressing specific temperatures along its scale (e.g., "Gallium melts at 29.7646°C" and "The temperature outside is 23 degrees Celsius"), the degree Celsius is also suitable for expressing temperature intervals -- differences between temperatures, or their uncertainties (e.g.
  • A brief introduction to temperature and temperature scales for students studying thermal physics or thermodynamics.