Patty's Industrial Hygiene, Physical and Biological Agents. Группа авторов

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      USEFUL EQUIVALENTS AND CONVERSION FACTORS

      1 kilometer = 0.6214 mile

      1 meter = 3.281 feet

      1 centimeter = 0.3937 inch

      1 micrometer = 1/25,4000 inch = 40 micro inches = 10,000 Angstrom units

      1 foot = 30.48 centimeters

      1 inch = 25.40 millimeters

      1 square kilometer = 0.3861 square mile (U.S.)

      1 square foot = 0.0929 square meter

      1 square inch = 6.452 square centimeters

      1 square mile (U.S.) = 2,589,998 square meters = 640 acres

      1 acre = 43,560 square feet = 4047 square meters

      1 cubic meter = 35.315 cubic feet

      1 cubic centimeter = 0.0610 cubic inch

      1 cubic foot = 28.32 liters = 0.0283 cubic meter = 7.481 gallons (U.S.)

      1 cubic inch = 16.39 cubic centimeters

      1 U.S. gallon = 3,7853 liters = 231 cubic inches = 0.13368 cubic foot

      1 liter = 0.9081 quart (dry), 1.057 quarts (U.S., liquid)

      1 cubic foot of water = 62.43 pounds (4°C)

      1 U.S. gallon of water = 8.345 pounds (4°C)

      1 kilogram = 2.205 pounds

      1 gram = 15.43 grains

      1 pound = 453.59 grams

      1 ounce (avoir.) = 28.35 grams

      1 gram mole of a perfect gas 24.45 liters (at 25°C and 760 mm Hg barometric pressure)

      1 atmosphere = 14.7 pounds per square inch

      1 foot of water pressure = 0.4335 pound per square inch

      1 inch of mercury pressure = 0.4912 pound per square inch

      1 dyne per square centimeter = 0.0021 pound per square foot

      1 gram‐calorie = 0.00397 Btu

      1 Btu = 778 foot‐pounds

      1 Btu per minute = 12.96 foot‐pounds per second

      1 hp = 0.707 Btu per second = 550 foot‐pounds per second

      1 centimeter per second = 1.97 feet per minute = 0.0224 mile per hour

      1 footcandle = 1 lumen incident per square foot = 10.764 lumens incident per square meter

      1 grain per cubic foot = 2.29 grams per cubic meter

      1 milligram per cubic meter = 0.000437 grain per cubic foot

      To convert degrees Celsius to degrees Fahrenheit: °C (9/5) + 32 = °F

      To convert degrees Fahrenheit to degrees Celsius: (5/9) (°F − 32) = °C

      For solutes in water: 1 mg/liter 1 ppm (by weight)

      Atmospheric contamination: 1 mg/liter 1 oz/1000 cu ft (approx)

      For gases or vapors in air at 25°C and 760 mm Hg pressure:

      To convert mg/liter to ppm (by volume): mg/liter (24,450/mol. wt.) = ppm

      To convert ppm to mg/liter: ppm (mol. wt./24,450) = mg/liter

      Factors for conversion of some units

      Mg/L × 28.32 = Mg/cubic foot

      Mg/L × 1000 = Mg /cubic meter

      Mg/cubic foot × 35.314 = Mg/cubic meter

      Mg/cubic meter × 0.2832 = Mg/cubic foot

      CONVERSION TABLE FOR GASES AND VAPORS^a (Milligrams per liter to parts per million, and vice versa; 25°C and 760 mm Hg barometric pressure)