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World's oldest school is in Canterbury, England. The King's School, as it is named, was founded in 597 AD.
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Every now and then you read about something that man "couldn't live without." Well, one thing you can be sure is absolutely necessary to life is oxygen. Without oxygen, a human being can not live more than a few minutes.
Oxygen is an element, the most plentiful element in the earth’s crust. It makes up nearly half of the crust and more than one-fifth of the air. Breathed into the lungs, it is carried by the red blood corpuscles in a constant stream to the body cells. There it burns the food, making the heat needed to keep the human engine going.
Oxygen combines very easily with most elements. When this takes place, we call the process "oxidation." When this oxidation takes place very quickly, we have "combustion." In almost all oxidations, heat is given off. In combustion, the heat is given off so fast that it has no time to be carried away, the temperature rises extremely high, and a flame appears.
So at one end we have combustion, the fast oxidation that produces fire and at the other end we have the kind of oxidation that burns the food in our body and keeps the life process going. But slow oxidations, by the oxygen of the air, are found everywhere. When iron rusts, paint dries, alcohol is changed into vinegar, oxidation is going on.
Liquid oxygen has a pretty blue color.
The air we breathe is a mixture chiefly of nitrogen and oxygen. So we can prepare oxygen from the air. It is done by cooling the air to very low temperatures until it becomes liquid. This temperature is more than 300 degrees below zero Fahrenheit. As soon as the liquid air warms up a little above that temperature, it boils. The nitrogen boils off first and oxygen remains. Many a life has been saved by giving people oxygen to make breathing easier when their lungs were weak