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. Abraham Lincoln was the US president during the American Civil War. Abraham Lincoln was the sixteenth US president who was elected to power in the year 1860. He represented the Republican Party. He was the first Republican to receive 180 of 303 electoral votes and forty percent of the popular vote. On March 4,1861 Lincoln took office as the president of the United States of America.