VISCOSITY--The internal resistance of a
TOXIC--Harmful, destructive, deadly;
liquid that tends to prevent it from flowing.
poisonous.
TRACKING--To ensure that helicopter
VOLATILITY--The ability of a fluid to
blades rotate in the same horizontal plane.
evaporate.
TURBULENCE--The flow of a fluid (liquid
WARNING--An operating procedure, prac-
or gaseous) within an object such that the velocity
tice, or condition, etc., that may result in injury
at any fixed point in the fluid varies irregularly.
or death if not carefully observed or followed.
VARIABLE GEOMETRY--A design that
WILL--A term used to indicate futurity,
allows the angle of a wing, intake ramp, or
never to indicate any degree of requirement for
exhaust duct to adjust to the best condition for
application of a procedure.
the most efficient use.
WINDMILLING--Rotating a gas turbine
V E L O C I T Y -- T h e rate of motion in a
engine without energizing the ignition system.
particular direction.
AI-6
