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OCIS
(OSHA
COMPUTERIZED
INFORMATION
SYSTEM):
A
comprehensive
database
that
contains
information
and
data
on
standards
interpretation,
chemical
information,
hazardous
waste
activity
5(a)(1)
citations,
a
health
hazard
evaluation
index,
training
materials
and
other
information
compiled
by
OSHA
on
subjects
related
to
occupational
safety
and
health.
OCTAVE
BANDS:
Ranges
of
frequencies.
These
octave
bands
are
identified
by
their
center
frequencies
(63,
125,
250,
etc.).
OHM:
A
measure
of
electrical
resistance.
A
wire
in
which
one
volt
produces
a
current
of
one
ampere
has
a
resistance
of
one
Ohm.
OPACITY:
Refers
to
the
amount
of
light
that
can
pass
through.
Normally
refers
to
the
degree
of
visibility
of
an
exhaust
plume.
Normal
measurement
technique
used
is
by
EPA
method
9.
OPPOSED-BLADE
DAMPER:
A
type
of
damper
where
the
blades
rotate
in
the
opposite
direction.
ORGANIC
COMPOUND:
A
compound
consisting
of
carbon,
hydrogen
and
oxygen
atoms.
OSHA:
Occupational
Safety
and
Health
Administration.
OSI
(Ounces
per
square
inch):
A
unit
of
pressure
equal
to
one
1/16
PSI
or
1.733
inches
of
water.
OXYGENATED
FUELS:
Gasoline
that
has
been
blended
with
alcohols
or
ethers
that
contain
oxygen
in
order
to
reduce
carbon
monoxide
and
other
emissions.
OZONE:
A
compound
consisting
of
three
oxygen
atoms,
that
is
the
primary
constituent
of
smog.
It
is
formed
through
chemical
reactions
in
the
atmosphere
involving
volatile
organic
compounds,
nitrogen
oxides
and
sunlight.
Ozones
can
initiate
damage
to
the
lungs
as
well
as
damage
to
trees,
crops
and
materials.
There
is
a
natural
layer
of
ozone
in
the
upper
atmosphere
that
shields
the
earth
from
harmful
ultraviolet
radiation.
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