Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Of, relating to, or indicating equal or constant temperatures.
- adj. Of or designating changes of pressure and volume at constant temperature.
- adj. Of or relating to an isotherm.
- n. An isotherm.
Century Dictionary and Cyclopedia
- 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. An isothermal line; an isotherm.
- 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. 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. In spectrophotometry, a curve showing the distribution of intensities in the spectrum of a source of light maintained at constant temperature. Also called isotherm.
Wiktionary
- adj. Of or pertaining to a process that takes place at constant temperature
- adj. Of or pertaining to an isotherm
- n. geography An isotherm
GNU Webster's 1913
- adj. Relating to equality of temperature, or an isotherm.
- adj. (Phys. Geog.) Having reference to the geographical distribution of temperature, as exhibited by means of isotherms
WordNet 3.0
- adj. of a process or change taking place at constant temperature
Examples
“‘isothermal’ is quite of modern invention; but what a long story it would be to tell the meaning of ‘_isothermal_ lines’, all which is summed up in and saved by the word.”
“The lines called isothermal, that is, lines of equal annual heat, are, therefore, of greatest importance to public economy, because the “zones of production” depend mainly on them. (”
“Republicanism, will _inevitably_ control the Mississippi river and master the destinies of all soil above the so-called isothermal line, and probably of much below it.”
The Continental Monthly, Vol. 1, No. 6, June, 1862 Devoted To Literature and National Policy
“At this part of Columbus's letter there is a very curious discussion of temperature, which shows that this careful observer, even at that time, made out the difference between what are called isothermal curves and the curves of latitude.”
The life of Christopher Columbus: from his own letters and journals and other documents of his time.
“Evilevitch and his colleagues from Lund University in Sweden, where Evilevitch was previously employed, and the Universite de Lyon in France used an experimental technique known as isothermal titration calorimetry (ITC) to directly measure the heat, and thus the thermal energy, released during viral genome ejection.”
“po is the pressure at ground level and zo= (RT/μ g) is called the isothermal scale height (about 8 km for the earth).”
“It's called an "isothermal," and we live in this one very much on purpose.”
“If the air be now heated up to 539° Fahr. = 1,000° absolute, and at the same time the piston is not allowed to move, the pressure is doubled; and when the piston is released, it would rise 12½ feet, provided that the temperature remained constant, and the indicator would describe a hyperbolic curve (called an "isothermal") because the temperature would have remained equal throughout.”
“Yet we might for the sake of peace have long borne with all this, and yielded to the old lie-based 'isothermal' cant, had it not resulted, as it inevitably must, in building up the most miserable, insolent, and arrogant pseudo aristocracy which ever made the name of aristocracy ridiculous, not excepting that of the court of the sable Emperor”
The Continental Monthly, Vol. 1, No. 1, January 1862 Devoted to Literature and National Policy
“In each system of 'isothermal' lines of equal curvature there reigns a”
COSMOS: A Sketch of the Physical Description of the Universe, Vol. 1
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