25 October 2004
Potential pressure exerted in all directions by a fluid at rest.
For a fluid in motion, it is measured in a direction normal to
the direction of flow. Usually expressed in inches water
gauge when dealing with air. (The tendency to either burst
or collapse the pipe.)
The algebraic sum of the velocity pressure and the static
pressure (with due regard to sign).
Ventilation term used to indicate the volume of controlled
outdoor air supplied to a building to replace air being
Linear flow rate of contaminated air through a slot. Usually
measured in meters per second (m/s) [feet per minute
An air suspension (aerosol) of particles, usually not solid,
often originating in a solid nucleus, formed from combustion
Threshold limit values
Values, established by ACGIH, for airborne toxic materials
are used as guides in the control of health hazards and
represent time-weighted concentrations to which nearly all
workers may be exposed 8 hours per day over extended
periods of time without adverse effects.
Minimum air velocity required to move the particulates in the
air stream, measured in m/s (fpm).
The gaseous form of substances which are normally in the
solid or liquid state and which can be changed to these
states either by increasing the pressure or decreasing the
Equipment or machinery that, while operating, generates a
fume, gas, vapor, or particulate hazardous to the health of
the operator. Parts washers, wood saws, and degrease
units are work pieces.