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www.livescience.com/28738-oxygen.html

Oxygen is the third most abundant element in the universe, according to the Thomas Jefferson National Accelerator Facility. However, its reactivity made it relatively rare in early Earth's atmosphere.

www.thoughtco.com/oxygen-facts-606572

Oxygen was the atomic weight standard for the other elements until 1961 when it was replaced by carbon 12. Oxygen made a good choice for the standard before much was known about isotopes because although there are 3 natural isotopes of oxygen, most of it is oxygen-16. This is why the atomic weight of oxygen (15.9994) is so close to 16.

www.thoughtco.com/fun-oxygen-facts-for-kids-3975945

Fresh water contains about 6.04 ml of dissolved oxygen per liter, while seawater only contains about 4.95 ml of oxygen. Get 10 Interesting Facts About the Element Oxygen, the Breath of Life Interesting Chemistry Facts

www.scienceforkidsclub.com/oxygen.html

Fire needs oxygen to burn, so if high levels of oxygen are present a fire can become quickly out of control. It can also cause things to explode. The Fun Facts About Oxygen ~ Did You Know… liquid oxygen is a pale-blue color? to liquify oxygen it must be cooled to a chilly -297.3 Fahrenheit (-183 Celsius)?

www.chemicool.com/elements/oxygen-facts.html

Here are 11 interesting facts about oxygen, abundant not only in our planet’s atmosphere, but also one of the most abundant elements in the universe. You can find out much more on our main oxygen page. Dry air is 21 percent oxygen, 78 percent nitrogen and 1 percent other gases. Oxygen does not burn – honestly!

www.britannica.com/science/oxygen

Oxygen, a colorless, odorless, tasteless gas essential to living organisms, being taken up by animals, which convert it to carbon dioxide; plants, in turn, utilize carbon dioxide as a source of carbon and return the oxygen to the atmosphere. Oxygen forms compounds by reaction with practically any other element.

factslegend.org/15-surprising-oxygen-facts-you-probably-didnt-know

Surprising Oxygen Facts You Must Know: 11-15. 11. Oxygen is a non-metallic element. But of all non-metallic elements, it is actually the most reactive. 12. Cold water has more dissolved oxygen than warm water. This is why polar oceans have more oxygen dissolved in them than normal oceans and seas. 13. We said in our previous article that too ...

thefactfile.org/oxygen-facts

With these facts about oxygen, let us understand more in detail about this life supporting element which is useful in many fundamental ways to millions of living species on the planet earth. 33 Important facts about Oxygen. 1. Oxygen was discovered in 1774 by Joseph Priestley in England. However, Carl Wilhelm Scheele (he called it “fire air ...

www.softschools.com/facts/periodic_table/oxygen_facts/181

Oxygen (O) has an atomic number of eight. This odorless, colorless gas has eight protons in the nucleus, and is pale blue in its liquid and solid states. Interesting Oxygen Facts: One fifth of the Earth's atmosphere is made up of oxygen and is the third most abundant element in the universe by mass. Oxygen is the most abundant element by mass ...

globalhealing.com/natural-health/11-facts-about-oxygen-you-probably-didnt-know

Facts About Oxygen 1. Little of What You Breathe Is Actually Oxygen. Oxygen is necessary for all animal life on this planet, but it only makes up a small portion of the air we breathe. Nitrogen makes up 78% of Earth’s atmosphere while oxygen comes in a distant second at about 21%.