Introduction - Mathematics and Statistics for the Environment - page 4

TABLE 1.2 (continued)
Alphabetical List of Conversion Factors

Factor Metric (SI) or English Conversions

1 day 24 hr (hours)

1440 min (minutes)
86,400 sec (seconds)
0.143 wk (weeks)
2.738 × 10 -3 yr (years)

1 dyne 1 × 10 -5 N (newton)

1 erg 1dyn•cm(dyne-centimeter)

1 × 10 -7 j (joules)
2.78 × 10 -11 Wh (watt-hours)

1 eV (electron volt) 1.602 × 10 -12 ergs

1.602 × 10 -19 j (joules)

1 fps (feet per second) 1.097 kmph (kilometers/hour)

0.305 mps (meters/second)
0.01136 mph (miles/hour)

1 ft (foot) 30.48 cm (centimeters)

12 in. (inches)
0.3048 m (meters)
1.65 × 10 -4 NM (nautical miles)
1.89 × 10 -4 mi (statute miles)

1 ft 2 (square foot)

2.296 × 10 -5 acres
9.296 cm 2 (square centimeters)
144 in. 2 (square inches)
0.0929 m 2 (square meters)

1 ft 3 (cubic foot) 28.317 cm 3 (cc, cubic centimeters)

1,728 in. 3 (cubic inches)
0.0283 m 3 (cubic meters)
7.48 gal (gallons)
28.32 L (liters)
29.92 qt (quarts)

1 g (gram) 0.001 kg (kilogram)

1000 mg (milligrams)
1,000,000 ng = 10 6 ng (nanograms)
2.205 × 10 -3 lb (pounds)

1 g/cm 3 (grams per cubic
centimeter)

62.43 lb/ft 3 (pounds/cubic foot)
0.0361 lb/in. 3 (pounds/cubic inch)
8.345 lb/gal (pounds/gallon)

1 gal (gallon) 3785 cm 3 (cc, cubic centimeters)

0.134 ft 3 (cubic feet)
231 in. 3 (cubic inches)
3.785 L (liters)

1 Gy (gray) 1 j/kg (joules/kilogram)

100 rad
1 Sv (sievert), unless modified through division by
an appropriate factor, such as Q or N

1 hp (horsepower) 745.7 j/sec (joules/sec)