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Conversion Factors (To Calculate Pounds for Gases & Liquids) <br /> Gases - To Convert from Standard Cubic Feet (SCF) to Pounds, Multiply By: <br /> Acetylene 0.073 <br /> Argon 0.112 <br /> Carbon Dioxide 0.1235 <br /> Helium 0.0111 <br /> Hydrogen 0.0056 <br /> Methane 0.0448 <br /> Nitrogen 0.078 <br /> Nitrous Oxide 0.123 <br /> Oxygen 0.0834 <br /> Propane 0.123 <br /> Liquids - To Convert from Gallons to Pounds, Multiply By: <br /> Gasoline 6.0 (range 5.8 - 6.2) <br /> Motor Oil (New & Waste) 7.5 (range 7.3 - 7.8) <br /> Water 8.3 <br /> Diesel 7.3 <br /> Antifreeze (50% ethylene glycol) 8.8 <br /> Perchloroethylene 13.4 <br /> Propane 4.5 <br /> The MSDS for each hazardous material that you handle also contains much of the same <br /> information as listed above. For example, to calculate the pounds for a liquid, find its <br /> specific gravity as listed on the MSDS. Then multiply the gallons that you handle by <br /> the specific gravity, and multiply again by 8.3. This is the number of pounds that you <br /> handle. <br />