Venturi A term used to define a shaped restriction in a pipe where a flowing fluid accelerates under pressure to maintain a constant volumetric flow the same as at other locations in the pipe.
Vertical A term used to indicate when something such as a pole is at 90 degrees to a horizontal surface.
Vice versa A term used to indicate that it may be possible for a condition to be in two separate but opposite states at different times.
Visqueen vapor barrier A vapor barrier of poly ethylene plastic. The vapor barrier is usually black when used under concrete slabs.
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