• WordNet 3.6
    • adj isothermal of a process or change taking place at constant temperature
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Webster's Revised Unabridged Dictionary
    • a Isothermal (Phys. Geog) Relating to equality of temperature, or an isotherm.
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Century Dictionary and Cyclopedia
    • isothermal Of the same degree of heat; of the same temperature; in physical geography, pertaining to or marking equality of temperature; exhibiting the geographical distribution of temperature: as, an isothermal line; the isothermal relations of different continents; an isothermal chart. Also isothermous.
    • n isothermal An isothermal line; an isotherm.
    • isothermal In crystallography, applied to the lines on a crystal face, or more generally to the surfaces in a crystal, which measure the rate of heat-conductivity, these lines or surfaces being characterized by equal degrees of temperature when heat is applied at a certain point. The isothermal lines on a crystal bear a simple relation to the molecular structure; for example, they are circles on the base of a hexagonal crystal, but ellipses on a prismatic face.
    • n isothermal In thermodynamics, a line or curve determined by the equation of state (pv = RT) of a system, when T has any constant value; a line of equal temperatures.
    • n isothermal In spectrophotometry, a curve showing the distribution of intensities in the spectrum of a source of light maintained at constant temperature. Also called isotherm.
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Chambers's Twentieth Century Dictionary
    • adj Isothermal ī-so-thėr′mal having an equal degree of heat
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Webster's Revised Unabridged Dictionary
Cf. F. isotherme,
Chambers's Twentieth Century Dictionary
Fr. isotherme—Gr. isos, equal, thermē, heat—thermos, hot.


In literature:

They have also comparatively high temperatures; the isotherm for 10 deg.
"The South Pole, Volumes 1 and 2" by Roald Amundsen
The present limit of trees is the isothermal which gives the mean temperature of 500 Fahr.
"The Ancient Life History of the Earth" by Henry Alleyne Nicholson
The temperate climatic zones extend from the annual isotherm of 20 deg.
"Influences of Geographic Environment" by Ellen Churchill Semple
According to the isotherms for the year the Victorians live in an atmosphere between eight and ten degrees hotter than our own.
"Crime and Its Causes" by William Douglas Morrison
Again, 'the isotherms of Canada pass through Iceland, across about the middle of Norway and Sweden, St Petersburg and Kamtschatka.
"Chambers's Edinburgh Journal, No. 438" by Various
The dotted lines are called 'isotherms' and they follow the lines of places having the same temperature.
"The Boy with the U. S. Weather Men" by Francis William Rolt-Wheeler
The irregular course of the isotherms is due to many causes.
"The Western United States" by Harold Wellman Fairbanks
The same isothermal line, passes through Prussia and Poland, the finest grain countries of Europe.
"Old Mackinaw" by W. P. Strickland
A chart of isothermal lines.
"Commercial Geography" by Jacques W. Redway
Isothermal Chart shewing the Temperature of the Earth's Surface.
"Elements of Agricultural Chemistry" by Thomas Anderson
Des lignes isothermes et de la distribution de la chaleur sur le globe, published in vol.
"A History of Science, Volume 5(of 5)" by Henry Smith Williams
Together they press into higher latitudes the annual isothermal lines.
"History of the Intellectual Development of Europe, Volume I (of 2)" by John William Draper
The polar limits of the temperate zones are fixed by the isotherm of 50 deg.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5" by Various
Within the isothermal of -72 deg.
"Man, Past and Present" by Agustus Henry Keane
The southern limit of its distribution approximates the isotherm of forty-five degrees.
"Butterflies Worth Knowing" by Clarence M. Weed
The July isotherm of 80 deg.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 7" by Various
The isothermal of 69 deg.
"Climatic Changes" by Ellsworth Huntington
Humboldt, in 1817, published a treatise on "Isothermal Lines," which initiated a fresh line for the study of atmospheric phenomena.
"Meteorology" by J. G. M'Pherson
The State of Washington has about the same isothermal line as North Carolina.
"The Columbia River" by William Denison Lyman
This is the ratio of the adiabatic elasticity of air to the isothermal elasticity.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2" by Various

In news:

Setpoint accuracy, stability and isothermality of ±0.1°C are common with a single-heated zone using an off-the-shelf temperature controller.
Neogen Corp ANSR (Amplified Nucleic Single Temperature Reaction) isothermal pathogen detection system.
The president of the North Carolina Community College System, Dr R Scott Ralls, will meet with the Isothermal Community College Board of Trustees today at 9 am to discuss the college's search for a new president.
Isothermal Community College's Small Business Center is for anyone.

In science:

GPa (see Fig. 1d) excluding all isotherms at temperature higher than 247 K, in order to remain in the validity range of the PEAG model.
Can experiments select the configurational component of excess entropy?
There are three kinds of shock, namely, Rankine-Hugoniot shock, isentropic shock and isothermal shock (Landau & Lifshitz 1987; Chakrabarti 1990).
Unification to the "Pseudo-General-Relativistic" analysis of accretion disks around rotating black holes and neutron stars
In the formation of isothermal shock the radiative cooling is very efficient and some energy and entropy are lost at the shock location keeping unchanged the temperature. ˙M+ < ˙M− and T+ = T− .
Unification to the "Pseudo-General-Relativistic" analysis of accretion disks around rotating black holes and neutron stars
To obtain the resulting accretion flow, we idealize this core as a singular isothermal sphere rotating rigidly with angular velocity Ω◦ .
Trapped Protostellar Winds and their Breakout
While this has been found to be true for isothermal bowshocks (Blondin & Koerwer 1998; Raga et al. 1997), the calculations we next describe indicate that this is not the case in our problem.
Trapped Protostellar Winds and their Breakout
As the mass of the hole increases, the core will start > rc , the cusp will to loose its identity until, when rBH ∼ join smoothly onto the r−2 isothermal profile.
The formation of galaxy stellar cores by the hierarchical merging of supermassive black holes
Using a simple assumption for the density profile of the cluster (an isothermal sphere with a tidal cutoff ), Gerhard modified the Chandrasekhar formula to take this effect into account.
Dynamical Friction on Star Clusters near the Galactic Center
From the theory of conformal transformations (see, e.g., Markushevitch, 1983), the “isothermal” net of resulting coordinates is orthogonal (except in the finite number of isolated singularities where F ′ = 0).
Non-Integrability of a weakly integrable Hamiltonian system
It is based on the claim that observationally, individual disk components are reasonably approximated by isothermal density profiles; this assumption included stars, dust, and Ba84b and Ba84c further extrapolated this to the unobserved dark matter as well.
Dark Matter in the Local Galactic Disk
Similarly, an expression can be obtained for the mass density by using the stellar distribution function for an isothermal population which has the following form.
Dark Matter in the Local Galactic Disk
First, the assumption that various tracer populations are in isothermal equilibrium must be verified observationally by showing the velocity distributions are Maxwellian.
Dark Matter in the Local Galactic Disk
In particular, a certain stellar population may actually include more than one isothermal component.
Dark Matter in the Local Galactic Disk
Furthermore, a model of the density profile, such as an isothermal equilibrium distribution, must first be calibrated to observations.
Dark Matter in the Local Galactic Disk
By decomposing matter in the solar neighborhood into separate isothermal populations, a broader more precise understanding can be obtained.
Dark Matter in the Local Galactic Disk
Using data from the Hipparcos catalogue, Ph97 studied the F stellar tracer population and measured the density using a slightly different technique employing the isothermal distribution assumption.
Dark Matter in the Local Galactic Disk