Conversions between humidity expressions

by R.L. Snyder, Biometeorologist, Atmospheric Science, University of California, Davis, California 


J. Paulo de Melo e Abreu,
Professor of Biometeorology, Lisbon Technical University, Lisbon, Portugal

Copyright (c) - Regents of the University of California.  All rights reserved.

Created November 2001

Last Revision - March 26, 2005 

An Excel program with the filename "CalHum.xls" is available to upload from this site.  The program makes conversions between humidity expressions.  All of the inputs are in degrees Celsius and kiloPascals (kPa).  The elevation and air temperature must be input. Then input one of the other variables to compute the other humidity expressions. To change the input variable, delete the current entry first and then  enter a new value. Do not cut and paste values!  To upload the program, click on CalHum. The conversions used are discussed in: 

Snyder, Shaw, and Paw U. (1987) Humidity Conversions Using a Computer Program. Applied Agric. Res. Vol. 2, No. 3, pp. 183-192.