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.
Abraham Lincoln lead our country through the civil war keeping it together. The big thing that he did was end slavery. He was the one who created the Emancipation Proclamationâ¦, which is what led to the end of slavery. Lincoln supported the Homestead Act, which allowed poor people in the east take land in the west.