Abu Bakr Muhammad bin Zakariya Razi or Zakaria Razi (251-313) was an omniscient,Iranian physician, philosopher, pharmacist and chemist Razi wrote lasting works in the field of medicine, chemistry and philosophy and is known as the discoverer of alcohol, sulfur essence (sulfuric acid) and kerosene. He also has valuable works on cosmology, logic and mathematics.According to George Sartan (the father of the history of science), Razi was the greatest physician of Iran during the middle centuries. Parviz Azkaei and Joel Kremer in the book "Cultural Revival in the Age of Al Boyeh" have considered Razi as a person who stands at the peak of Iranian humanismIn recognition of Razi's great efforts in pharmaceuticals in Iran, the fifth day of Shahrivar (August 27) has been named the day of commemorating Razi, the great Iranian chemist, and the day of pharmacists.