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Acid-base indicators are chemicals used to determine whether an aqueous solution is acidic, neutral, or alkaline. Because acidity and alkalinity relate to pH, they may also be known as pH indicators. Examples of acid-base indicators include litmus paper, phenolphthalein, and red cabbage juice.
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Oxygen
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I'm not completely sure about the explosion part but I know oxygen fuels fire.
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Not exactly sure what you mean by this, but "The average density of an object equals its total mass divided by its total volume."
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