# Water vapor pressure calculation - HMT130

## HMT130 User Guide

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

Vapor pressure refers to the vapor pressure of water in air or other gas. Water vapor has a partial pressure Pw which is part of the total pressure of the gas.

Water vapor pressure (Pw) is calculated with the following formula: