- The name for the element oxygen comes from Greek words that mean ‘acid former’.
- Oxygen is the most abundant chemical element, by mass, in our biosphere, air, sea and land.
- Oxygen was discovered by Carl Wilhelm Scheele in Sweden in 1771 and then by Joseph Priestley in 1774.
- Oxygen is the third most abundant chemical element in the universe, after hydrogen and helium.
- Oxygen is an essential factor for burning up the body’s toxins.
- Oxygen constitutes 49.2% of the Earth's crust by mass and is the major component of the world's oceans (88.8% by mass).
- Humans inhale more than 6 billion tones of oxygen each year.
- Earth is unusual among the planets of the Solar System in having such a high concentration of oxygen gas in its atmosphere: Mars (with 0.1% O2 by volume) and Venus have far lower concentrations.
- About 2/3 of the human body contains oxygen or cells with oxygen on them.
- Excited oxygen is responsible for the bright red and yellow-green colors of the aurora.
- All major classes of structural molecules in living organisms, such as proteins, carbohydrates, and fats, contain oxygen, as do the major inorganic compounds that comprise animal shells, teeth, and bone.
- Ordinary oxygen makes up approximately 21 percent of our atmosphere.
- Oxygen therapy is used to treat emphysema, pneumonia, some heart disorders, and any disease that impairs the body’s ability to take up and use gaseous oxygen.
- About 0.9% of the Sun's mass is oxygen.
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