The normal range for the A1c test is between 4 percent and 6 percent for people without diabetes. The ideal range for people with diabetes is generally less than 7 percent.For diagnostic purposes, two separate A1c tests at 6.5 percent are positive for diabetes.he normal range for the A1c test is between 4 percent and 6 percent for people without diabetes. The ideal range for people with diabetes is generally less than 7 percent.
History: Discovered in 1855 by Sir Henry Bessemer. The Bessemer process was discovered through Sir Henryâs attempts to manufacture steel faster and more cheaply. Particularly for the purpose of manufacturing military weapons, which were at the time made with iron, which is considerably heavier than steel.
Bessemer process. The Bessemer process was the first inexpensive industrial process for the mass production of steel from molten pig iron before the development of the open hearth furnace. The key principle is removal of impurities from the iron by oxidation with air being blown through the molten iron. The oxidation also raises the temperature of the iron mass and keeps it molten. Related decarburizing with air processes had been used outside Europe for hundreds of years, but not on an industrial scale. One such