| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| isotherm |
| line drawn on a map of a particular region of the earth’s surface connecting points of equal temperature; each point reflects one temperature reading or an average of several readings over a period of time. The relative spacing of the isothermal lines indicates a temperature gradient, i.e., the amount of temperature change over a given distance. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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