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Topic: Thermodynamic temperature


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 TEMPERATURE FACTS AND INFORMATION
Temperature is the physical property of a system which underlies the common notions of "hot" and "cold"; the material with the higher temperature is said to be hotter.
It is a fundamental parameter in thermodynamics and it is conjugate to entropy.
Temperature in respect to matter is a property only of macroscopic amounts and serves to gauge the average intensity of the random ''actual'' motions of the individually mobile particulate constituents.
www.splammer.com /?req=temperature   (2575 words)

  
 Thermodynamic temperature - Wikipedia, the free encyclopedia
Thermodynamic temperature is the absolute measure of temperature and is one of the principal parameters of thermodynamics.
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 lowest possible temperature where nothing could be colder and no heat energy remains in a substance.
Thermodynamic temperature’s null point, absolute zero, is the temperature at which the particle constituents of matter have minimal motion (retaining only quantum mechanical motion) and zero heat energy remains in a substance.
en.wikipedia.org /wiki/Thermodynamic_temperature   (6171 words)

  
 temperature - a Whatis.com definition   (Site not responding. Last check: 2007-10-07)
Thermodynamic temperature is a measure of the kinetic energy in molecules or atoms of a substance.
This is the temperature scheme that astronomers use to measure the heat in distant objects such as the sun's corona or the gas and dust between stars.
In the centigrade or Celsius temperature scale, the freezing point of pure water at one atmosphere is assigned the value zero; the boiling point is +100 C. One-degree increments in the centigrade scale are the same size as those in the kelvin scale.
searchcrm.techtarget.com /gDefinition/0,294236,sid20_gci553020,00.html   (487 words)

  
 Temperature -- from Eric Weisstein's World of Physics
Temperature (sometimes called thermodynamic temperature) is a measure of the average kinetic energy of the particles in a system.
Temperatures are commonly measured in the Kelvin or Celsius scales, with Fahrenheit still in common use in the Unites States.
Temperature is an important quantity in thermodynamics and kinetic theory, appearing explicitly for example in the ideal gas law
scienceworld.wolfram.com /physics/Temperature.html   (196 words)

  
 The Thermodynamic Atmosphere Effect Explained Stepwise   (Site not responding. Last check: 2007-10-07)
The causes for this difference in temperature, given by climatology explanations, shall be the impact of trace quantities of “optically active” gases (“greenhouse gases”) in the atmosphere, which shall obstruct the thermal radiation leaving the earth towards space.
The temperature, at the planet's shell, within the air layer and at the core, adjusts uniformly to the temperature of the shell, thus to 255 K (-18°C).
The cause for the higher temperature at the base of an atmosphere it is that the removal of energy from the atmosphere toward space occurs essentially via radiation from the upper layers of the gas atmosphere, where the transition from the gas state into a vacuum-like state takes place, on the basis of temperature.
www.geocities.com /atmosco2/atmos.htm   (4185 words)

  
 Base unit definitions: Kelvin
The definition of the unit of thermodynamic temperature was given in substance by the 10th CGPM (1954) which selected the triple point of water as the fundamental fixed point and assigned to it the temperature 273.16 K, so defining the unit.
The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
The unit of Celsius temperature is the degree Celsius, symbol °C, which is by definition equal in magnitude to the kelvin.
physics.nist.gov /cuu/Units/kelvin.html   (211 words)

  
 Temperature Measurement Facts   (Site not responding. Last check: 2007-10-07)
Thermodynamics is the science of the ralationship between heat, work and the properties of thermodynamic systems.
Temperature is the measure of the heat intensity and has nothing to do with the size or heat capacity of an object.
He originally set 0º to be the temperature of boiling water and 100º to be the freezing temperature of water.
www.geocities.com /david_swaim/tempconv.htm   (1092 words)

  
 About Temperature
Thermodynamic temperature is the fundamental temperature; its unit is the kelvin which is defined as the fraction 1 / 273.16 of the thermodynamic temperature of the triple point of water.
The way that the gas temperature scale and the thermodynamic temperature scale are shown to be identical is based on the microscopic interpretation of temperature, which postulates that the macroscopic measurable quantity called temperature is a result of the random motions of the microscopic particles that make up a system.
Temperature becomes a quantity definable either in terms of macroscopic thermodynamic quantities such as heat and work, or, with equal validity and identical results, in terms of a quantity which characterized the energy distribution among the particles in a system.
www.thermometricscorp.com /abtem.html   (4857 words)

  
 NIST - Fluid Metrology Group - Selected Abstracts (Metrology)
Thermodynamic temperatures of the triple points of mercury and gallium and in the interval 217 K to 303 K. Moldover, S.J. Boyes, C.W. Meyer, and A.R.H. Goodwin
We describe a quasi-spherical, noble-gas-filled cavity designed to determine the thermodynamic temperature of the gas from measurements of the frequencies and the half-widths of microwave and acoustic resonances in the cavity.
The International Temperature Scale of 1990 (ITS-90) is defined from 0.65 K upwards to the highest temperature measurable by spectral radiation thermometry, the radiation thermometry being based on the Planck radiation law.
properties.nist.gov /fluidsci/metrlgy.html   (2717 words)

  
 About Temperature
One of the first attempts to make a standard temperature scale occurred about AD 170, when Galen, in his medical writings, proposed a standard "neutral" temperature made up of equal quantities of boiling water and ice; on either side of this temperature were four degrees of heat and four degrees of cold, respectively.
Thermodynamic temperature is the fundamental temperature; its unit is the kelvin which is defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water.
Temperature is a measure of the energy of thermal motion and, at a temperature of zero, the energy reaches a minimum (quantum mechanically, the zero-point motion remains at 0 K).
eo.ucar.edu /skymath/tmp2.html   (4839 words)

  
 OMEGA ENGINEERING - The International Temperature Scale of 1990
The International Temperature Scale of 1990 was adopted by the International Committee of Weights and Measures at its meeting in 1989, in accordance with the request embodied in Resolution 7 of the 18th General Conference of Weights and Measures of 1987.
The unit of the fundamental physical quantity known as thermodynamic temperature, symbol T, is the kelvin symbol K, defined as the fraction 1/273.16 of the thermodynamic temperature of the triple point of water1.
The unit of the physical quantity T90 is the kelvin, symbol K, and the unit of the physical quantity T90 is the degree Celsius, symbol ºC, as is the case for the thermodynamic temperature T and the Celsius temperature t.
www.omega.com /techref/intltemp.html   (2998 words)

  
 Temperature - Wikipedia, the free encyclopedia
Temperature is a physical property of a system that underlies the common notions of hot and cold; something that is hotter has the greater temperature.
Temperature is one of the principal parameters of thermodynamics.
Temperature is a measure of the average energy of the particles (atoms or molecules) of a substance.
en.wikipedia.org /wiki/Temperature   (3041 words)

  
 [No title]
A temperature gradient as in a layer of sea water, in which the temperature decrease with depth is greater than that of the overlying and underlying water.
] Any of the quantities defining the thermodynamic state of a substance in thermodynamic equilibrium; for a perfect gas, the pressure, temperature, and density are the fundamental thermodynamic variables, any two of which are, by the equation of state, sufficient to specify the state.
A photocopying process in which the original copy is placed in contact with a transparent sheet and is exposed to infrared rays; heat from carbon or a metallic compound in the text ink then causes a chemical change in a substance laminated between the transparent sheet of paper and a white waxy back.
www.accessscience.com /Dictionary/T/T12/DictT12.html   (2229 words)

  
 Thermodynamic self-consistency: Configurational temperature
The temperature of an equilibrium ensemble of particles is defined conventionally in terms of the particles' mean kinetic energy, without regard for their instantaneous positions.
The temperature is reflected in the instantaneous distribution of forces because objects explore more of their potential energy landscape as the temperature increases.
The successful collapse of the configurational and hyperconfigurational temperatures to the thermodynamic temperature constitutes a set of stringent internal self-consistency tests for the accuracy of the measured pair potential and its correct interpretation.
www.physics.nyu.edu /~dg86/codef04b/node5.html   (967 words)

  
 Unit of thermodynamic temperature (kelvin)   (Site not responding. Last check: 2007-10-07)
The definition of the unit of thermodynamic temperature was given in substance by the 10th CGPM (1954, Resolution 3) which selected the triple point of water as the fundamental fixed point and assigned to it the temperature 273.16 K by definition.
The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermody-namic temperature of the triple point of water (13th CGPM (1967), Resolution 4).
To express Celsius temperature, the unit "degree Celsius," which is equal to the unit "kelvin," is used; in this case, "degree Celsius" is a special name used in place of "kelvin." An interval or difference of Celsius temperature can, however, be expressed in kelvins as well as in degrees Celsius.
www.cs.tut.fi /~jkorpela/SI/kelvin.html   (200 words)

  
 Thermodynamic Temperature   (Site not responding. Last check: 2007-10-07)
Equation (23.20) provides us with a physical definition of temperature which is independent of specific material properties such as the thermal expansion coefficient of some particular metal.
Note that the unit of temperature is the Kelvin degree according to this theory.
Boltzmann's constant is thus simply a scaling factor which changes temperature to energy just as multiplication by the speed of light converts time to distance.
www.physics.nmt.edu /~raymond/classes/ph13xbook/node235.html   (120 words)

  
 Replace the kelvin!
SI unit of thermodynamic temperature named in his honor is seldom used except for scientific work.
A thermodynamic temperature scale is vastly preferable to either the Celsius or Fahrenheit temperature scale.
This creates a thermodynamic temperature with units equal to 0.273160 K or 0.491688°R. With the proposed thermodynamic temperature unit, the freezing point of water is 999.963, or very nearly 1000.
home.comcast.net /~igpl/Replace_the_kelvin.html   (809 words)

  
 NIST - Physical and Chemical Properties Division - Technical Highlights   (Site not responding. Last check: 2007-10-07)
Objectives: (1) To reduce the uncertainty in the determination of the thermodynamic temperature by a factor of 3 to 8 in the range from 500 K to 900 K using speed-of-sound measurements in low density argon as a primary standard and (2) to improve the accuracy of the high-temperature fixed points (e.g.
The data determine the speed of sound in the argon from which the thermodynamic temperature is deduced.
Moldover, M.R., Boyes, S.J., Meyer, C.W., and Goodwin, A.R.H., "Thermodynamic Temperatures of the Triple Points of Mercury and Gallium and in the Interval 217 K to 303 K," J. Res.
www.boulder.nist.gov /div838/tar/file30.html   (397 words)

  
 General Chemistry Online: Glossary:
A device that senses temperature changes by using a pair of joined wires made of dissimilar metals that produces a voltage that changes with temperature.
is at thermodynamic equilibrium if the energy it gains from its surroundings is exactly balanced by the energy it loses, no matter how much time is allowed to pass.
The temperature and pressure at which the solid, liquid, and gaseous forms of a substance are at equilibrium
antoine.frostburg.edu /chem/senese/101/glossary/t.shtml   (1088 words)

  
 [No title]
The temperature on a scale whose zero corresponds to zero pressure or zero volume of a gas.
A sequence of thermodynamic steps (usually four) which takes heat via a working substance through a sequence of thermodynamic processes and returns the system to its initial internal energy.
The theory derived from the second law of thermodynamics which concludes that the temperature of the universe is inexorably headed toward a uniform value throughout all space.
www.lycoming.edu /astr-phy/thermo.html   (697 words)

  
 2.4 Thermodynamic Temperature
If we hadn't already developed a good temperature scale, we could use the fact that the efficiency of a Carnot engine depends only on the operating temperatures to develop one.
Given a heat bath at a reference temperature (eg a very large triple-point cell) we could use the efficiency of a Carnot engine working between it and another body to label that other body's temperature.
itself is a perfectly good temperature scale, which vanishes at absolute zero: this is called the thermodynamic temperature.
theory.ph.man.ac.uk /~judith/stat_therm/node27.html   (200 words)

  
 Units of Measurement - Thermodynamic Temperature
Note: In addition to the thermodynamic temperature (symbol T), expressed in kelvins, use is also made of Celsius temperature (symbol t) defined by the equation t = T-T
Triple point of water cells are used at NPL to realise the triple-point temperature (273.16 K) with a reproducibility of 0.1 mk.
Other temperatures may be related to this via the International Temperature Scale in terms of which platinum resistance and other thermometers are calibrated within the range of 0.65 K to 3000 K. See our brief Introduction to Temperature Measurement.
www.npl.co.uk /reference/temperature.html   (149 words)

  
 International Temp Stds
The unit of the fundamental physical quantity known as thermodynamic temperature, symbol T, is the kelvin symbol K, defined as the fraction 1 / 273.16 of the thermodynamic temperature of the triple point of water.
A difference of temperature may be expressed in kelvin or degrees Celsius.
is the degree Celsius, symbol ºC, as is the case for the thermodynamic temperature T and the Celsius temperature t.
www.electro-optical.com /unitconv/tempref/its90.html   (2828 words)

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