Frames can be made to hold the lenses in several different ways. There are three common styles: full frame, half frame, and frameless. Full frame glasses have the frame go all around the lenses. Half frames go around only half the lens; typically the frames attach to the top of the lenses and on the side near the top.
Ethanol is a monohydric primary alcohol. It melts at - 117.3Â°C and boils at 78.5Â°C. It is miscible (i.e., mixes without separation) with water in all proportions and is separated from water only with difficulty; ethanol that is completely free of water is called absolute ethanol.t is miscible (i.e., mixes without separation) with water in all proportions and is separated from water only with difficulty; ethanol that is completely free of water is called absolute ethanol.
Ethanol is produced in 3 ways: 1  Ethanol is produced both as a petrochemical (chemical products derived from petroleum), through the hydration of ethylene. 2  Biologically, by fermenting sugars with yeast. 3  Ethanol may also be produced industrially from ethene (ethylene). The largest single use of ethanol is as a motor fuel and fuel additive. 2  Ethanol combustion in an internal combustion engine yields many of the products of incomplete combustion produced by gasoline. 3  Hydrous ethanol (about 95% ethanol and 5% water) can be used as fuel in more than 90% of new cars sold in the country.