thermodynamic temperature

(noun)

Temperature defined in terms of the laws of thermodynamics rather than the properties of a real material: expressed in kelvins.

Related Terms

Examples of thermodynamic temperature in the following topics:

  • 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.
    • This conclusion may seem obvious, because all three have the same temperature, but zeroth law is basic to thermodynamics.
    • 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.
    • Discuss how the Zeroth Law of Thermodynamics justifies the use of thermodynamic temperature

  • 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.
    • It is one of the principal parameters of thermodynamics and kinetic theory of gases.
    • 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:

  • 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 scale is an absolute, thermodynamic temperature scale using absolute zero as its null point.
    • In the classical description of thermodynamics, absolute zero is the temperature at which all thermal motion ceases.
    • The kelvin is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water (exactly 0.01°C, or 32.018°F).
    • A brief introduction to temperature and temperature scales for students studying thermal physics or thermodynamics.

  • 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.
    • However, in the interpretation of classical thermodynamics, kinetic energy can be zero, and the thermal energy of matter vanishes.
    • The zero point of a thermodynamic temperature scale, such as the Kelvin scale, is set at absolute zero.
    • A brief introduction to temperature and temperature scales for students studying thermal physics or thermodynamics.

  • The Zeroth Law of Thermodynamics

    • The Zeroth Law of Thermodynamics states that systems in thermal equilibrium are at the same temperature.
    • There are a few ways to state the Zeroth Law of Thermodynamics, but the simplest is as follows: systems that are in thermal equilibrium exist at the same temperature.
    • What the Zeroth Law of Thermodynamics means is that temperature is something worth measuring, because it indicates whether heat will move between objects.
    • Temperature is not mentioned explicitly, but it's implied that temperature exists.
    • The systems A, B, and C are at the same temperature.

  • Celsius Scale

    • Celsius, or centigrade, is a scale and unit of measurement for temperature.
    • It is one of the most commonly used temperature units.
    • This definition also precisely relates the Celsius scale to the Kelvin scale, which defines the SI base unit of thermodynamic temperature and which uses the symbol K.
    • 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.

  • Isothermal Processes

    • An isothermal process is a change of a thermodynamic system, in which the temperature remains constant.
    • An isothermal process is a change of a system, in which the temperature remains constant: ΔT = 0.
    • In thermodynamics, the work involved when a gas changes from state A to state B is simply
    • It is also worth noting that, for many systems, if the temperature is held constant, the internal energy of the system also is constant, and so $\Delta U = 0$.
    • From the first law of thermodynamics, it follows that $Q =-W$ for this same isothermal process.

  • The Second Law

    • The second law of thermodynamics states that heat transfer occurs spontaneously only from higher to lower temperature bodies.
    • The second law of thermodynamics deals with the direction taken by spontaneous processes.
    • For example, heat involves the transfer of energy from higher to lower temperature.
    • The law that forbids these processes is called the second law of thermodynamics .
    • The Second Law of Thermodynamics(first expression): Heat transfer occurs spontaneously from higher- to lower-temperature bodies but never spontaneously in the reverse direction.

  • 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.

  • Work

    • Thermodynamic work encompasses mechanical work (gas expansion, ) plus many other types of work, such as electrical.
    • As such, thermodynamic work is a generalization of the concept of mechanical work in mechanics.
    • It necessarily excludes energy transferred between systems as heat, which is modeled distinctly in thermodynamics.
    • Heat transfer, a less organized process, is driven by temperature differences.
    • Both heat and work can cause a temperature increase.