Symbol |
Definition |
N |
N/A |
Not Applicable |
nbp |
normal boiling point |
NDIR |
Non–Dispersive Infrared
Analyzer |
NDUV |
Non–Dispersive Ultraviolet
Analyzer |
NER |
normal evaporation rate |
NFNF |
National Formulary |
NFPA |
National Fire Protection
Association |
NIOSH |
National Institute for
Occupational Safety and
Health |
NIST |
National Institute of Standards
and Technology |
nm |
nanometer(s) |
NMR |
Nuclear Magnetic Resonance
Spectroscopy |
No |
number |
nom |
nominal |
NOS |
Not Otherwise Specified |
NPD |
Nitrogen/Phosphorous
Detector |
NPT |
National Pipe Thread |
NTP |
Normal Temperature and
Pressure |
NTRM |
NIST Traceable Reference
Material |
O |
OD |
Outside Diameter |
Ohm–cm |
ohms centimeter |
OSHA |
Occupational Safety and
Health Administration |
oz |
ounce(s |
P |
Pa |
Pascal(s) |
PAMS |
Photochemical Air Monitoring
Systems |
PID |
Photo Ionization Detector |
ppb |
part(s) per billion |
ppba |
part(s) per billion atomic |
ppbv |
part(s) per billion by volume |
ppbw |
part(s) per billion by weight |
ppm |
part(s) per million |
ppma |
part(s) per million atomic |
ppmv |
part(s) per million by volume |
ppmw |
part(s) per million by weight |
ppt |
part(s) per trillion |
ppta |
part(s) per trillion atomic |
pptv |
part(s) per trillion by volume |
pptw |
part(s) per trillion by weight |
psi |
pound(s) – force per
square inch |
psia |
pound(s) – force per
square inch absolute |
psig |
pound(s) – force per square
inch gauge |
Q |
QA |
Quality Assurance |
QC |
Quality Control |
R |
Ra |
Roughness average |
RFO |
Restricted Flow Orifice |
°R |
degree(s) Rankine |
S |
scc |
standard cubic centimeters |
sccm |
standard cubic centimeters
per minute |
sccs |
standard cubic centimeters
per second |
scfh |
standard cubic feet per hour |
scfm |
standard cubic feet per minute |
scfs |
standard cubic feet per second |
sec |
second(s) |
SFC |
Supercritical Fluid Chromatography |
SFE |
Supercritical Fluid Extraction |
slpm |
standard liters per minute |
sp. gr. |
specific gravity |
sp. vol. |
specific volume |
SRM |
Standard Reference Materials |
SS |
Stainless Steel |
Stn. Stl |
Stainless Steel |
STEL |
Short Term Exposure Limit |
STP |
Standard Temperature and
Pressure |
T |
TCD |
Thermal Conductivity Detector |
TEA |
Transversely Excited
Atmosphere |
THC |
Total Hydrocarbon Content |
TLV |
Threshold Limit Value |
tp |
triple point |
TPH |
Total Petroleum Hydrocarbons |
TWA |
Time Weighted Average |
U |
UEL |
Upper Explosive Limiit |
UHP |
Ultra High Purity |
UN |
United Nations |
USP |
United States Pharmacopoeia |
V |
VAC |
Volts Alternating Current |
VDC |
Volts Direct Current |
VOC |
Volatile Organic Compounds |
vol |
volume |
vol% |
volume percent |
W |
w.c. |
water column pressure |
wt. |
weight |
wt% |
weight percent |
wt. ppm |
weight parts per million |
Y |
yd |
yard(s) |
Other Symbols |
> |
Greater than |
≥ |
Greater than or equal |
< |
Less than |
≤ |
Less than or equal |