isotherm

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.

---

isotherm

1. a line on a map linking places of equal temperature

2. Physics a curve on a graph that connects points of equal temperature

---

isotherm [′ī·sə‚thərm]

(geophysics)

A line on a chart connecting all points of equal or constant temperature.

(thermodynamics)

A curve or formula showing the relationship between two variables, such as pressure and volume, when the temperature is held constant. Also known as isothermal.