Basic Units of Measurement and Conversions - Basic Mathematics for Water and Wastewater Operators - page 56

TABLE 2.6 (continued)
Alphabetical List of Conversion Factors

Factor Metric (SI) or English Conversions

1 mi 2 (square mile) 640 acres

2.79 × 10 7 ft 2 (square feet)
2.59 × 10 6 m 2 (square meters)

1 min (minute) 6.94 × 10 -4 day

0.0167 hr (hour)
60 sec (seconds)
9.92 × 10 -5 wk (week)
1.90 × 10 -6 yr (year)

1 mmHg (mm of mercury)

1.316 × 10 -3 atm (atmosphere)
0.535 inch H 2 O (inch of water)
1.33 mb (millibars)
133.32 Pa (pascals)
1 torr
0.0193 psia (pounds/square inch absolute)

1 mph (mile per hour) 88 fpm (feet/minute)

1.61 kmph (kilometers/hour)
0.447 mps (meters/second)

1 mps (meter per second) 196.9 fpm (feet/minute)

3.6 kmph (kilometers/hour)
2.237 mph (miles/hour)

1 N-m (newton-meter) 1.00 J (joule)

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 (atmosphere)
4.015 × 10 -3 inch H 2 O (inches of water)
0.01 mb (millibar)
7.5 × 10 -3 mmHg (millimeters of mercury)

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

1.00 mg/kg (milligram/kilogram)

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

27.67 inch 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 (liter)