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Updated: Jan 2, 2026

Ammonia Synthesis at Low Pressure
Published on: August 23, 2017
Thermodynamic Properties of Ammonia as an Ideal Gas
1Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234.
Abstract:
Thermodynamic functions for ammonia as an ideal gas at one atmosphere pressure have been evaluated. The contribution of the highly anharmonic out-of-plane vibrational mode, including its large coupling with rotation and its coupling with the other vibrational modes, is considered in detail. Tables of , , , and S°/R have been calculated at closely spaced intervals from 50 to 5000 °K within an overall uncertainty of less than 0.1 percent at 1000 °K.
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