A THERMISTOR HYGROMETER FOR THE DIRECT MEASUREMENT OF THE FREE ENERGY OF SOIL MOISTURE

A new technique is described which enables the thermodynamic soil moisture variable of free energy or total suction to be measured directly. It relies on adsorption, by the glass coating of a thermistor, of vapor from the ambient atmosphere in equilibrium with the soil moisture. The amount of heat or the time required to evaporate the adsorbed moisture from the thermistor can be calibrated against soil moisture suction. With further development the method should provide an in situ technique for use below the soil surface, where temperatures are relatively stable. /TRRL/

  • Corporate Authors:

    Commonwealth Scientific & Indus Res Org, Australia

    Division of Soils, 314 Albert Street
    East Melbourne, Victoria,   Australia 
  • Authors:
    • Richards, B G
  • Publication Date: 1965-11

Media Info

  • Features: Figures; References;
  • Pagination: 11 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00263512
  • Record Type: Publication
  • Source Agency: International Road Research Documentation, OECD
  • Report/Paper Numbers: TR 5
  • Files: ITRD, TRIS
  • Created Date: Dec 13 1974 12:00AM