BharatNotes Isotherm
noun/ˈaɪsəʊˌθɜːm/
A line drawn on a map or chart connecting points that have the same temperature at a given time or the same mean temperature over a given period.
Usage in a UPSC answer
In mapping the country's deepening climate stress, planners increasingly rely on shifting isotherms, whose poleward and altitudinal migration signals the encroachment of heat-stressed zones onto once-temperate agricultural belts.
Synonyms
isothermal linetemperature contourisoplethisolinecontour line
Word Family
isothermal (adj), isothermally (adv), isothermics (n)
Root
Greek isos = equal; thermē = warmth, heat; coined by Humboldt, 1817 via French isotherme
Etymology
From French isotherme, coined by Alexander von Humboldt in 1817, combining Greek isos ("equal") and thermē ("warmth, heat").
Memory Hook
ISO = "equal" + THERM = "heat" (as in thermometer/thermal): an isotherm joins places of equal heat, i.e. the same temperature.
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