Its Joseph Priestley
He isolated new air and made the oxygen pure O2
see
http://en.wikipedia.org/wiki/Joseph_Priestley
plants need oxygen
In 1774 Joseph Priestley discovered oxygen. He conducted several experiments and one of them showed that plants release oxygen into the air.
He found out that plants release the oxygen we need for respiration.
Discovered that a gas, oxygen and a fuel was was essential to the process of burning.
he discovered that to burn an object you need oxygen wagwan fam
Joseph Priestley discovered that what he called "dephlogisticated air" was in fact oxygen. This discovery challenged the prevailing theory of phlogiston, and laid the foundation for understanding the role of oxygen in combustion and respiration. Priestley's work on oxygen was crucial in the development of modern chemistry.
Joseph Priestly
Oxygen
Hediscoveredmedical oxygen.
he discovered oxygen
Joseph Priestley of England discovered oxygen and Carl Scheele of Sweden they both discovered it around the same time.
Joseph Henry did not discover oxygen. Joseph Priestley and Carl Wilhelm Scheele are the two men who independently discovered oxygen in 1774. Scheele actually discovered it first, but Priestley was the first to publish his findings. Joseph Henry is the person who discovered the electromagnetic phenomenon of self-inductance.