Alternate meanings: White (disambiguation)
White is a color (more accurately it contains all the colors of the spectrum and is sometimes described as an achromatic color— black is the absence of color) that has high brightness but zero hue. The impression of white light can be created by mixing (via a process called " additive mixing") appropriate intensities of the primary color spectrum: red, green and blue, but it must be noted that the illumination provided by this technique has significant differences from that produced by incandescence (see below).
1 Paint
In painting, white can be created by reflecting ambient light from a white pigment. White when mixed with black produces gray.
2 White light
Until Newton's work became accepted, most scientistsFor the scientific journal named Science see Science (journal). Science is both a process of gaining knowledge, and the organized body of knowledge gained by this process. The scientific process is the systematic acquisition of new knowledge about a syste believed that white was the fundamental color of light; and that other colors were formed only by adding something to light. Newton demonstrated that white was formed by combining the other colors.
In the science of lighting, there is a continuum of colors of light that can be called "white". One set of colors that deserve this description are the colors emitted, via the process called incandescence, by a black bodyIn physics a black body is an object that absorbs all light that falls onto it: no light passes through it nor is reflected. Despite the name, black bodies do radiate light. The term "black body" was introduced by Gustav Kirchhoff in 1862. The light emitt at various relatively-high temperatures. For example, the color of a black body at a temperature of 2848 kelvinsThe kelvin (symbol: K is the SI unit of temperature, and is one of the seven SI base units. It is defined by two facts: zero kelvin is absolute zero (when molecular motion stops), and one kelvin is the fraction 1/273. 16 of the thermodynamic temperature o matches that produced by domestic incandescent light bulbs. It is said that "the color temperatureWhite light is commonly described by its color temperature . A light source's color temperature is calculated by comparing it to the color of light a black-body radiator gives off when heated. Daylight has a color temperature of about 5500 K. Heating an i of such a light bulb is 2848 K". The white light used in theatre illumination has a color temperature of about 3200 K. Daylight has a nominal color temperature of 5400 K (called equal energy white), but can vary from a cool red up to a bluish 25,000 K. Not all black bodyIn physics a black body is an object that absorbs all light that falls onto it: no light passes through it nor is reflected. Despite the name, black bodies do radiate light. The term "black body" was introduced by Gustav Kirchhoff in 1862. The light emitt radiationRadiation generally means the transmission of objects or information from a source into a surrounding medium or destination. Within physics, related concepts are: Ionizing radiation is a stream of particles (photons or other particles) with sufficient ene can be considered white light: the background radiation of the universeAlternate uses: See Universe (disambiguation In the first half of the 20th century, the word universe was used to mean the whole spacetime continuum in which we exist, together with all the energy and matter within it. Attempts to understand the universe, to name an extreme example, is only a few kelvins and is quite invisible.
3 Standard whites
Standard whites are often defined with reference to the International Commission on Illumination's (CIE's) chromaticity diagram. These are the D series of standard illuminants. Illuminant D65, originally corresponding to a color temperature of 6,500 K, is taken to represent standard daylight.
