vacuum: See suction.
vadose zone: See aerated zone.
vapor intrusion: See soil vapor intrusion.
vapor pressure: See under evaporation.
viscosity: Degree of being viscous. A measurement related to the internal properties of a liquid that offer resistance to flow. Demonstrated by the thickness or thinness of a liquid. Internal friction caused by molecular cohesion in liquids. Viscosity may be reported in different ways:
(1)Marsh funnel seconds. The time it takes for 1000 cm3 of drilling mud or other liquid to flow through the funnel. The longer the time in seconds, the more viscous is the mud.
(2)Yield point and plastic viscosity in centipoises. Using the combination of plastic viscosity and yield point, the plastic viscosity indicates the flow characteristics of the fluid when it is moving rapidly, and the yield point indicates the flow characteristics when it is moving very slowly or at rest. In both cases, higher values indicate a more viscous fluid. SPWLA.
volume: Of water. A specific quantity of water generally expressed in terms of acre feet. An acre foot is defined as the amount of water required to cover one acre of land to a depth of one foot and is equivalent to 43,560 cubic feet or 325,872 gallons. Douglas Co.
vug, vugular porosity: Secondary porosity formed in sediment by the dissolution of soluble minerals and/or enlargement of micro-fractures.
Compiled and Edited by Robert C. Ransom
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