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

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)

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Molecular Weight	1 mg/liter ppm	1 ppm mg/liter	Molecular Weight	1 mg/liter ppm	1 ppm mg/liter	Molecular Weight	1 mg/liter ppm	1 ppm mg/liter
1	24,450	0.0000409	39	627	0.001595	77	318	0.00315
2	12,230	0.0000818	40	611	0.001636	78	313	0.00319
3	8,150	0.0001227	41	596	0.001677	79	309	0.00323
4	6,113	0.0001636	42	582	0.001718	80	306	0.00327
5	4,890	0.0002045	43	569	0.001759	81	302	0.00331
6	4,075	0.0002454	44	556	0.001800	82	298	0.00335
7	3,493	0.0002863	45	543	0.001840	83	295	0.00339
8	3,056	0.000327	46	532	0.001881	84	291	0.00344
9	2,717	0.000368	47	520	0.001922	85	288	0.00348
10	2,445	0.000409	48	509	0.001963	86	284	0.00352
11	2,223	0.000450	49	499	0.002004	87	281	0.00356
12	2,038	0.000491	50	489	0.002045	88	278	0.00360
13	1,881	0.000532	51	479	0.002086	89	275	0.00364
14	1,746	0.000573	52	470	0.002127	90	272	0.00368
15	1,630	0.000614	53	461	0.002168	91	269	0.00372
16	1,528	0.000654	54	453	0.002209