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Stripper for Bubble-Free Tensiometry

1150 University Ave., Sterling Hall, Univ. of Wisconsin, Madison, WI 53706-1390

Amir Salehzadeh

Suite 180, Engineering 1-A, Univ. of Michigan, Ann Arbor, MI 48109-2125

*Corresponding author.

ABSTRACT

Unwanted formation of air bubbles in the liquid water inside soil water tensiometers has always been a major nuisance afflicting this simple, fast, and accurate device. The stripper, a plastic wall (usually just a tubing wall) between the tensiometer water and a wet vacuum (containing some droplets of liquid water), strips any dissolved air out of this water. Bubbles cannot grow, they will shrink and disappear, unless the water pressure inside the tensiometer is less than the vapor pressure of water (at the ambient temperature). Choices of desirable plastic materials and other considerations are based on 7 yr of development and employment of this method.

Received for publication February 20, 1992.