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V
- V-Path - In angle beam tests of plate or cylindrical sections, the
path of the ultrasonic beam in the test object from point of entry
on the front surface to the back surface and reflecting to the
front surface again. See also skip distance.
- Valence Shell - The
outer electron ring of any atom.
- Van de Graaf generator - an
electrostatic type x-ray generator in the million and multimillion
volt category.
- Vector - A quantity having
amplitude (magnitude) and direction. Normally represented as a line
whose length represents the quantity’s magnitude and the angular
position the phase (relative to some reference).
- Vector field
- See resultant.
- Velocity - Directional distance
traveled per unit time.
- Vertical Limit
- The readable level of vertical indication on an
A-scan.
- Vertical Linearity
- See linearity, amplitude.
- Vibration - A rapid
back and forth motion of a particle or solid.
- Vibrational Motion - Moving backward and forward, like a
pendulum.
- Video Presentation
- A cathode ray tube presentation in which
radiofrequency signals have been rectified and usually
filtered.
- Virgin curve - The original
magnetizing curve of a material.
- Viscosity - Resistance
to flow of a liquid.
- Visible dye penetrant - An
intensely colored (usually red) highly penetrating liquid which
will provide maximum contrast with the white developer when used
for detection of surface discontinuities.
- Visual Acuity - The
space visible to an eye in a given position of
gaze.
- Volt (V) - (1) The
unit of electromotive force or potential difference that will cause
a current of one ampere to flow through a conductor whose
resistance is one ohm. (2) The unit of electromotive force or
potential difference between two points when one joule of energy is
used to move one coulomb of charge from one point to the
other.
- Voltage - Electromotive force or
difference in electrical potential. Expressed in volts.
- Voltmeter - The instrument
used to measure voltage.