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This is a unique variation on electrolysis (using electricity to take water apart) that will let you test to see which side of a battery is positive, and which side is negative.
This time we are going to talk about a very important substance, oxygen. Oxygen is the third most abundant element in the universe, coming after hydrogen and helium. About 20% of the air around you is made up of oxygen, and it is vitally important to life on Earth. It is also important for combustion, and that is what we will explore today.