
An emagram is one of four thermodynamic diagrams used to display temperature lapse rate and moisture content profiles in the atmosphere. The emagram has axes of temperature (T) and pressure (p). In the emagram, the dry adiabats make an angle of about 45 degrees with the isobars, isotherms are vertical and isopleths of saturation mixing ratio are a...
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http://en.wikipedia.org/wiki/Emagram

a thermodynamic chart indicating temperature as the abscissa on a linear scale and pressure as the ordinate on a logarithmic scale.
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https://www.infoplease.com/dictionary/emagram
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