# Saturation vapor pressure calculation - HMT130

## HMT130 User Guide

Document code
M211280EN
Revision
D
Language
English (United States)
Product
HMT130
Document type
User guide

Saturation vapor pressure (Pws) is the equilibrium water vapor pressure in a closed chamber containing liquid water. It is a function only of temperature, and it indicates the maximum amount of water that can exist in the vapor state.

Water vapor saturation pressure (Pws) is calculated with the following 2 formulas:

where
T
Temperature in K
Ci
Coefficients
C0
0.49313580
C1
-0.46094296 * 10-2
C2
0.13746454 * 10-4
C3
-0.12743214 * 10-7
where
bi
Coefficients
b-1
-0.58002206 * 104
b0
0.13914993 * 101
b1
-0.48640239 * 10-1
b2
0.41764768 * 10-4
b3
-0.14452093 * 10-7
b4
6.5459673