Absolute zero: The lowest temperature possible. The value is 0 degrees Kelvin, -273.15(degrees) Celsius and -459.67 degrees Fahrenheit. The point at which theoretically no molecular activity exists, or the temperature at which the volume of a perfect gas vanishes.
Tom Skilling is chief meteorologist at WGN-TV. His forecasts can be seen Monday through Friday on WGN-TV News at noon and 9 p.m.