Thermodynamic diagram

From Glossary of Meteorology
(Redirected from Aerological diagram)

thermodynamic diagram

(Sometimes called adiabatic chart, adiabatic diagram.) Any chart of graph representing values of pressure, density, temperature, water vapor, or functions therof, such that the equation of state, the Clapeyron-Clausius equation, and the first law of thermodynamics for adiabatic and saturation of pseudoadiabatic processes are satisfied.

A very large number of individual diagrams fall under this general description. These common diagrams are mathematical transformations of each other. They display (reading counterclockwise about a point) isobars (approximately horizontal), isotherms, vapor lines, saturation or pseudoadiabats, and dry adiabats. When an air parcel undergoes a reversible process, the succession of states is represented on the thermodynamic diagram by a curve. A cyclic process is represented by a closed curve. On some charts the area so enclosed is directly proportional to the work done in the process, and some authors prefer to restrict the user of "thermodynamic diagram" to such charts. See table below.

Thermodynamic diagram chart.png




Copyright 2024 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.