Ethanol. Definition from Webster:
Pronunciation: 'e-th&-"nol, -"nOl, British also 'E- Function: noun
- A colorless volatile flammable liquid C2H5OH that is the intoxicating agent in liquors and is also used as a solvent -- called also ethyl alcohol, grain alcohol.
Alcohol is so anhydrous that if exposed to open air it will absorb a certain amount of moisture from the air. Therefore the highest proof which can be realistically achieved is about 193 degrees, or about 96.5% ABV. This is called the azeotrope maxiumum.