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It is a measure of the opacity of smoke. Ringlemann grid cards run from 0 - all white smoke to 5- all black smoke. See Bureau of Mines Circular ic8333, a link to it is available on the NIOSH site at: www.cdc.gov/Niosh/mining/pubs/pubreference/outputid330.htm
According to the U.S National Institute of Occupational Safety and Health (NIOSH)'s table of scheduled charges, a fatal injury is equivalent to a loss of 6,000 man days
Not every relation is a function. But every function is a relation. Function is just a part of relation.
The cubic function.
Range