Oxygen

Oxygen Oxygen, Symbol O, Colorless, Tasteless, Tasteless, Slightly Magnetic Gas Element. On the earth, oxygen is more abundant than any other element. In 1774, British chemist Joseph Priestley and Swedish chemist Carl Wilhelm Cher independently discovered oxygen. French chemist Antoine Laurent Lavoisier proved that it is elemental gas in classical combustion experiments. In high temperature torches a large amount of oxygen is used and a mixture of oxygen and other gases produces a much higher flame temperature than that obtained by burning the gas in air.

Oxygen isotopes are used as an ancient thermometer. Oxygen exists in two forms, oxygen - 16 and oxygen - 18. They bind to calcite skeletons of marine organisms at different rates, depending on water temperature, more oxygen-18 at low temperature, and higher oxygen-16. At the bottom of the floor 25 where the main mass disappears, the oxygen isotope ratio changes abruptly, showing a global temperature rise of 6 ° C. This may not be so much, but it will have a major impact on the ecology of the world. Climatologists have recently been extremely excited about half the world temperature rise.

After the appearance of the photochemical system II, the oxygen level rises. Dissolved oxygen in the sea increases with oxygen in the atmosphere. This is sometimes called oxygen genocide. Oxygen is a very good electron acceptor, which brings about a great destructive effect on the living body. Many bacteria are anaerobic and die almost immediately when oxygen is present. Other creatures such as animals have a special way to avoid damage of cells caused by this element (in fact it is necessary for it to survive). First, when oxygen started to accumulate in the environment, it was neutralized by already existing substances. Iron present in high concentrations in the ocean is oxidized and precipitates. Evidence of this situation can be seen in the iron band during this period, a layer of iron deposited on the ocean floor. As one geologist said, "The world is rusty." After all, it will be high enough to be dangerous to life.