Kelvin
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Named after a Scots scientist of the 19th century, the Kelvin scale is another way to measure temperature like Fahrenheit or Celsius. Light consists of various colors, as you can see when light passes through a prism. The Kelvin scale measures the light in terms of whether it trends toward the orange or blue. The deep blue sky of the tropics is about as blue as possible, and is designated as 10,000 Kelvin. An intense sunset goes almost completely orange on the Kelvin scale to a 2,500 reading.