Thermocouple psychrometry
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Abstract
Thermocouple psychrometry is a technique that infers the water potential of the liquid phase of a sample from measurements within the vapor phase that is in equilibrium with the sample. The theoretical relation between water potential of the liquid phase and relative humidity of the vapor phase is given by the Kelvin equation
Ψ = energy/volume = (RT/Vw) ln(p/po) [3.2.3–1]
where ψ is water potential (sum of matric and osmotic potential, MPa), R is the universal gas constant (8.314 × 10-6 MJ mol-1 K-1), T is temperature (K), Vw is molar volume of water (1.8 × 10-5 m3 mol-1), and p/po is relative humidity expressed as a fraction where p is actual vapor pressure of air in equilibrium with the liquid phase (MPa) and po is saturation vapor pressure (MPa) at T.
| Publication type | Book chapter |
|---|---|
| Publication Subtype | Book Chapter |
| Title | Thermocouple psychrometry |
| Series title | Soil Science Society of America Book Series |
| Series number | 5.4 |
| Chapter | 3.2.3 |
| ISBN | 978-0-89118-893-3 |
| DOI | 10.2136/sssabookser5.4.c22 |
| Year Published | 2002 |
| Language | English |
| Publisher | Soil Science Society of America |
| Publisher location | Madison, WI |
| Contributing office(s) | Nevada Water Science Center, Toxic Substances Hydrology Program |
| Description | 34 p. |
| Larger Work Type | Book |
| Larger Work Subtype | Monograph |
| Larger Work Title | Methods of Soil Analysis: Part 4 Physical Methods |
| First page | 609 |
| Last page | 642 |
| Google Analytic Metrics | Metrics page |