Inch/Pound to SI
| Multiply |
By |
To obtain |
| Length |
| foot (ft) |
0.3048 |
meter (m) |
| mile (mi) |
1.609 |
kilometer (km) |
SI to Inch/Pound
| Multiply |
By |
To obtain |
| Volume |
| liter (L) |
0.2642 |
gallon (gal) |
| cubic centimeter (cm3) |
0.06102 |
cubic inch (in3) |
| Mass |
| gram (g) |
0.03527 |
ounce, avoirdupois (oz) |
| kilogram (kg) |
2.205 |
pound avoirdupois (lb) |
Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:
°F=(1.8×°C)+32.
Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25°C).
Concentrations of most chemical constituents in water are given either in milligrams per liter (mg/L) or micrograms per liter (µg/L).
Chlorofluorocarbon (CFC) concentrations are given in units of picograms per kilogram (pg/kg) and picomoles per kilogram (pmol/kg). One picogram is 10-12 grams. One picomole is 10-12 moles. One mole contains 6.022 × 1023 atoms or molecules of a substance. Sulfur hexafluoride (SF6) concentrations are given in units of femtograms per kilogram (fg/kg) and femtomoles per kilogram (fmol/kg). One femtogram is 10-15 grams. One femtomole is 10-15 moles. CFC and SF6 concentrations also are given in units of parts per trillion by volume (pptv), which represents the atmospheric concentration that would have yielded a measured aqueous concentration assuming equilibrium partitioning between atmosphere and water under the specified conditions (recharge temperature, recharge elevation, and excess air concentration).
Tritium concentrations are given in units of Tritium Units (TU). Based upon a tritium half-life of 12.32 years (Lucas and Unterweger, 2000), 1 TU is equal to 3.22 picocuries per liter.
Helium-3 (3He) data are reported as δ values computed from the formula
where Rx is the ratio of 3He to 4He in the sample, RSTD is the 3He to 4He ratio of the reference standard air (1.384 × 10-6), and δ3He is expressed in percent.
Excess air concentrations (see Glossary) are reported in units of cubic centimeters at standard temperature and pressure (STP) per kilogram of water (cc STP/kg), and helium (He) and neon (Ne) concentrations are reported in units of cubic centimeters (at standard temperature and pressure) per gram of water (cc STP/g). One cc STP of He or Ne is equal to 2.6868 × 1019 atoms.
Datum
Vertical coordinate information is referenced to the National Geodetic Vertical Datum of 1929 (NGVD 29).
Altitude, as used in this report, refers to distance above the vertical datum.
Abbreviations and Acronyms
| Ar |
argon |
| 14C |
carbon-14 |
| CFC |
chlorofluorocarbon |
| CH4 |
methane |
| CO2 |
carbon dioxide |
| DWH |
NAWQA Data Warehouse |
| Fe |
Iron |
| FSS |
Flow System Study |
| FY |
fiscal year |
| He |
helium |
| 3H |
tritium |
| 3He |
helium-3 |
| 4He |
helium-4 |
| LUS |
Land-Use Study |
| MAAT |
mean annual air temperature |
| MAS |
Major-Aquifer Study |
| Mn |
Manganese |
| N2 |
nitrogen (in the form dnitrogen) |
| NAWQA |
National Water-Quality Assessment Program |
| Ne |
neon |
| O2 |
oxygen (in the form dioxygen) |
| REF |
Reference well |
| SF6 |
sulfur hexafluoride |
| SIO |
Scripps Institution of Oceanography |
| SIP |
standard temperature and pressure |
| SUS |
Study-Unit SUrvey |
| TU |
tritium unit |
| UA |
unfractionated air |
| USGS |
U.S. Geological Survey |
|
First posted July 31, 2012
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