The permissible exposure limit (PEL or OSHA PEL) is a legal limit in the United States for exposure of an employee to a chemical substance or physical agent.For chemicals, the chemical regulation is usually expressed in parts per million (ppm), or sometimes in milligrams per cubic meter (mg/m 3). short-term exposure limit is one that addresses the average exposure over a 15-30 minute period of maximum exposure during a single work shift.
Abraham Lincoln became the United States' 16th President in 1861, issuing the Emancipation Proclamation that declared forever free those slaves within the Confederacy in 1863.
answer by oldog confidence votes 5 8k abraham lincoln is important for two things first he established that the united states the central government in washington dc has powers that are superior to the powers of the individual states whenever the united states chooses to exercise themfor better or for worse that was the outcome of the u s civil warbraham lincoln was a bad president he used the blacks and slavery as an excuse to punish the south the emancipation proclamation only freed slaves in the confederate states he broke treaties he had with the souix indians he also didnt follow the constitution