What do you mean by is isopleth?

Explanation

The word Isopleth is derived from Iso means equal and pleth means lines. Thus, an imaginary line, which joins the places of equal values is referred to as isopleth. The more frequently drawn isopleths include isotherm (equal temperature), isobar (equal pressure), isohytes (equal rainfall), isonephs (equal cloudiness), isohels (equal sunshine), contours (equal heights), isobaths (equal depths), isohaline(equal salintiy), etc,