"केल्विन" (अनुभाग) सम्पादित करें

== वर्ण तापमान ==
 <!-- The kelvin is often used in the measure of the [[color temperature]]of light sources. Color temperature is based upon the principle that a [[black body|black body radiator]] emits light whose color depends on the temperature of the radiator. Black bodies with temperatures below about 4000 K appear reddish whereas those above about 7500 K appear bluish. Color temperature is important in the fields of image projection and [[photography]] where a color temperature of approximately 5500 K is required to match “daylight” film emulsions. In [[astronomy]], the [[stellar classification]] of stars and their place on the [[Hertzsprung-Russell diagram]] are based, in part, upon their surface temperature, known as [[effective temperature]]. The photosphere of the Sun, for instance, has an effective temperature of 5777 K. -->