Exhaled air at sea level still contains roughly 16% oxygen.
All the minerals in this group contain carbon and oxygen joined together.
Air contains less oxygen than water, but much more of the oxygen is in a form we can use.
Cylinders containing medical oxygen must be black with a white shoulder.
As water contains oxygen, it does not in fact prevent the paint from drying anyway!
Because the chamber contains little oxygen, the components do not actually burn.
Shortly after the Earth was formed, the atmosphere contained very little oxygen.
Today's atmosphere contains 21% oxygen, which is high enough for this rapid development of animals.
Most scientists agree that the Earth's atmosphere contained very little oxygen when the planet formed 4.5 billion years ago.
Air and water contain oxygen so they are usually the reason for rust.
