Word: c8h18
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...octane gas to World War II's 100 octane plus came slowly. Octane rating is the index of antiknock qualities.* Before 1922 the only way to raise this rating was to increase the percentage of isooctane (and similar compounds). Isooctane is a hydrocarbon, C8H18, which is one of the hundreds of compounds which make up the chemical mixture called gasoline. But isooctane alone makes a poor fuel because it is not volatile enough, does not readily carburet into explodible vapor...
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