different between isopach vs isopleth

English

iso- + Ancient Greek ????? (pakhús, “thick”) (see pachy-).

isopach (plural isopachs)

(geology) A line on a chart joining parts of a stratigraphic unit that have the same thickness; an isopachous line.

From iso- +? Ancient Greek ?????? (plêthos, “a great number”).

isopleth (plural isopleths)

A line drawn on a map through all points having the same value of some measurable quantity.
Synonyms: isoline, isarithm, isogram, isopract
(thermodynamics) A line in a phase diagram indicating the same mole fraction.

For a complete list of types of isopleth, see Category:en:Isolines.

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