Vaisala—can be Vaisala Finland or Vaisala Inc. (U.S. subsidiary)
valence—Give single valences as Li+, 0-; two: 0=, Pb2+; three or more: 03-, Pb3+; etc.
Van Allen radiation belts—cap V and A
vectors—bold face; the vector V
velocity-gram—takes a hyphen
versus—abbreviate vs. (with period) [revised 2/00]
vice-president—Use the hyphen in all positions when referring to a UCAR vice-president. But the vice president of the United States. [revised 2/00]
video tape—two words if it refers to the kind of tape (as opposed to magnetic tape)
videotape—one word if it refers to a video tape recording
viewgraph—the common noun. Vugraph is a trade name.
vis-à-vis—Always include the accent.
volcano names—capitalize when "Mount" does not appear in the name: Redoubt Volcano, Pavlov Volcano, but Mount Spurr volcano, Mt. Pinatubo.
von Kármán—Include both accents.
vs.—versus (with period); not in italics [revised 2/00]
Vugraph—a trade name. Use viewgraph for the common noun.