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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)