Introduction - Mathematics and Statistics for the Environment - page 7

TABLE 1.2 (continued)
Alphabetical List of Conversion Factors

Factor Metric (SI) or English Conversions

1 N-m (newton-meter) 1.00 j (joules)

1 NM (nautical mile) 6076.1 ft (feet)

1.852 km (kilometers)
1.15 mi (statute miles)
2025.4 yd (yards)

1 Pa (pascal) 9.87 × 10 -6 atm (atmospheres)

4.015 × 10 -3 in. H 2 O (inches of water)
0.01 mb (millibars)
7.5 × 10 -3 mmHg (milliliters of mercury)

1 ppm (parts per million) 1.00 mL/m 3 (milliliters/cubic meter)

1.00 mg/kg (milligrams/kilogram)

1 psi (pounds/square inch) 0.068 atm (atmospheres)

27.67 in H 2 O (inches of water)
68.85 mb (millibars)
51.71 mmHg (millimeters of mercury)
6894.76 Pa (pascals)

1 qt (quart) 946.4 cm 3 (cc, cubic centimeters)

57.75 in. 3 (cubic inches)
0.946 L (liters)

1 rad 100 ergs/g (ergs/gram)

0.01 Gy (gray)
1 rem, unless modified through division by an
appropriate factor, such as Q or N

1 rem 1 rad, unless modified through division by an

appropriate factor, such as Q or N

1 Sv (sievert) 1 Gy, unless modified through division by an

appropriate factor, such as Q or N

1 torr 1.33 mb (millibars)

1 W (watt) 3.41 BTU/hr (British Thermal Units/hour)

1.341 x10 -3 hp (horsepower)
52.18 j/sec (joules/second)

1 week 7 days

168 hr (hours)
10,080 min (minutes)
6.048 × 10 5 sec (seconds)
0.0192 yr (years)

1 Wh (watt-hour) 3.412 BTUs (British Thermal Units)

859.8 cal (calories)
3600 j (joules)
35.53 L atm (liter-atmosphere)

1 yd 3 (cubic yard) 201.97 gal (gallons)

764.55 L (liters)

1 yr (year) 365.25 days

8766 hr (hours)
5.26 × 10 5 min (minutes)
3.16 × 10 7 sec (seconds)
52.18 weeks