Psychrometer table according Assamnn Volume 1 CD, paperback -Tables about Saturation Vapour Pressure on Ice and Water- Psychrometer Tables on Ice and Water for artificially ventilated Assmann Psycrometer

In this edition of the psychrometric table the current changes of the psychrometric constant have been considered. The basis for the calculation is the psychrometer formula according to Dr. Sonntag as well as the psychrometer formula recommended by the WMO (CIMO Guide No.8, Issue 1128 pp., 2014, update 2017). This aspiration psychrometer table allows the determination of the saturation vapor pressure over ice and water in a temperature range of max. -60 °C to +60 °C and the rel. Humidity in the measuring range from 1-100 % r. F. The assumption is always the knowledge of the psychometric difference and the dry temperature which is readable in 0.1-K-steps in the tables. All calculated measures refer to the international standard atmosphere (ISA). The atmospheric pressure is 1013.25 hPa. Corrections must be made when calculating saturation vapor pressures in high and low pressure ranges. The buyer of both Books gets an CD and a PDF from the author

The starting point are measurements with a naturally ventilated Assmann psychrometer, described in WMO CIMO Guide no. 8 of 2008 [2] as a standard psychrometer. (Sections 4.2.2 / 4.2.6 / 4.9.7)
In Part 1, the saturated vapor pressure in [hPa] is reported over ice and then over water according to two different formulas in a table for comparison.
The partial vapor pressure PVp [hPa], the relative humidity U = R.Hum [%] and the frost point temperature tFrost [° C] are calculated from the temperatures measured on the dry and wet thermometer, whereby only the values ​​U = R.Hum and tFrost [° C] are listed in the tables.
All values ​​were calculated using a C program in Visual Studio 2010 on a 64-bit platform with double precision. The relative humidity and the frost point temperature were calculated for the output
with a decimal place that gives saturated vapor pressure with four decimal places. The decimal separators are represented as, (comma), for better readability be thousands separators than. (Dot) inserted.