Vehicle Identification Numbers (VINs) Vehicle Identification Numbers are unique codes given to each on-road vehicle in the United States. From 1981, each new car is given a standardized 17-digit code, which includes a serial number. Older cars may have VINs too, although they will not follow the standardized formula.
The vacuum tube (known as a 'valve' in the UK) is an interesting component that made many important technologies possible and it is still used in many things. There are many kinds of vacuum tubes for different jobs. Most types of vacuum tubes have been replaced by semiconductor devices, however vacuum tubes will occupy an important role in the future in the field of nanotechnology. All 'tubes' basically consist of an anode and cathode in a gas or vacuum environment.
(ËvÃ¦kjÊÉm) n, pl vacuums or vacua (ËvÃ¦kjÊÉ) 1. (General Physics) a region containing no matter; free space. Compare plenum3. 2. (General Physics) a region in which gas is present at a low pressure. 3. (General Physics) the degree of exhaustion of gas within an enclosed space: a high vacuum; a perfect vacuum. 4. a sense or feeling of emptiness: his death left a vacuum in her life.