Ethanol is a flammable, volatile, colorless and transparent liquid at normal temperature and pressure, and its toxicity is low, so pure liquid cannot be directly drunk. It has a special fragrance and is slightly irritating; Slightly sweet with pungent taste.
Ethanol is flammable, and its vapor can form an explosive mixture with air, and can be mixed with water in any proportion. It is miscible with chloroform, ether, methanol, acetone and most other organic solvents.
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The physical properties of ethanol are mainly related to the properties of its low-carbon linear alcohol. The hydroxyl groups in the molecule can form hydrogen bonds, so ethanol is more viscous and less polar than organic compounds with similar relative molecular weight.
Ethanol can also react with acidic potassium dichromate solution. When ethanol vapor enters the silica gel containing acidic potassium dichromate solution, it can be seen that the silica gel changes from orange red to gray green. This reaction can be used to test whether the driver is drunk driving (drunk driving).