Function ps = mollier_ps_ashrae2013(T); returns the saturation vapour pressure in Pa for the given air temperature in degrees C. The used approximation is given by Ashrae, and was based on work of Hyland and Wexler 1983. See also the m-files: mollier_Td_ashrae2013.m mollier_ps_magnus.m mollier_ps_baehr.m mollier_ps_tetens.m Reference: 2013 ASHRAE handbook - Fundamentals - SI Edition (Chapter 1 Psychrometrics) Atlanta: ASHRAE, 2013 (c) 2026 fabien van mook 2026.08.20 release of this file within package "fvm-mollier" under GNU GPLv3+