Encyclopedia of Environmental Science and Engineering, Volume I and II

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APPENDIX

SELECTED PROPERTIES

TABLE 1

Conversion factors

To Convert From To Multiply by

Angstrom units Centimeters 1 
 10 ^8

Angstrom units Microns 1 
 10 ^4

Atmospheres Centimeters of mercury at 0C7 6

Atmospheres Dynes per square centimeter 1.01325 
 106

Atmospheres Feet of water at 39.1F 33.899

Atmospheres Grams per square centimeter 1,033.3

Atmospheres Inches of mercury at 32F 29.921

Atmospheres Millimeters of mercury 760

Atmospheres Pounds per square inch 14.696

Atmospheres Bars 1.0133

Barrels, oil Gallons (US) 42

Boiler horsepower Btu per hour 33,479

Btu Calories (gram) 252

Btu Foot-pounds 777.98

Btu Joules (absolute) 1,054.8

Btu per minute Foot-pounds per second 12.96

Calories, gram Btu 3.968 
 10 ^3

Calories, gram Foot-pounds 3.087

Calories, gram Joules 4.185

Candles (International) Lumens (International) per steradian 1.000

Candlepower (spherical) Lumens 12.566

Candles per square inch Lamberts 0.48695

Centimeters Angstrom units 1 
 108

Centimeters Feet (British or US) 0.032808

Centimeters Inches (US) 0.393700

Centimeters of mercury at 0C Atmospheres 0.013158

Centimeters of mercury at 0C Dynes per square centimeter 1.33322 
 104

Centimeters of mercury at 0C Kilograms per square meter 135.95

Centimeters of mercury at 0C Pounds per square foot 27.845

Centimeters per second Feet per minute 1.9685

Centimeters per second Miles per hour 0.02237

Centipoises Pound mass per foot-second 0.672 
 10 ^3

Centipoises Kilogram mass per meter-second 1 
 10 ^3

(continued)

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