Does Color Affect Temperature

The color of the object affects the rate at which radiant heat is absorbed and released from the object. This affects the rate at which the object temperature rises or falls under similar conditions.

Dark objects absorb more heat and light radiation and reflect fewer objects. If the temperature is higher than the ambient environment, the object also dissipates heat faster by radiation. In contrast, optical objectives do not absorb or dissipate rapidly. Therefore, the temperature of a dark object rises faster as it is exposed to heat and light than a bright object. In addition, when placed in a cooler environment, the temperature of the dark object drops faster than the temperature of the bright object under the same conditions. Black is best suited for absorbing and emitting thermal radiation, so it can be heated and cooled as fast as possible. Since white is the slowest to absorb and release thermal radiation, heating and cooling takes a relatively long time.

Firstly, the dark objects have this appearance due to the total absorption of all the wavelengths and without these wavelengths being reflected. However, since light is a form of energy expression, we know the law of conservation of energy, so that light absorbed by dark objects does not disappear but is retained or emitted by dark objects. .

But temperature is also related to color. This is because the heat radiates light (for example filament of an incandescent bulb). The temperature of the object affects the color of synchrotron radiation. "Red hot" ones emit red light and "white hot" ones emit white light. How does this work? There are some complex details, but here is the foundation: as discussed in the class, temperature is a measure of the energy inside the material. The hotter the material, the faster it moves. However, when charged particles oscillate, they emit light. If electrons or ions (the atomic centers that contain the electrons inside, not the atoms bound to the atoms) vibrate sufficiently fast, it will shine. Obviously, the higher the temperature of the object, the more frequent this occurs and the more frequently it is related. Therefore, a hot object that looks dark red is colder than an object that will be bright orange. But that is not the case. An example is shown in the figure.

It can be said that light has color temperature. Color temperature is a measure relating color of light emitted from an object to its temperature. As the color temperature rises, the emitted light turns into a more bluish hue. Actually, since the actual temperature is different from the color temperature, the correction factor is used. The scale uses the color of the abstract object called black body radiator. The black body radiator absorbs all its energy and radiates. This ratio can also be applied to photo lighting and the sun, but it can also be applied to any light source using a correction factor to make the actual surface not optimal for black body radiators .