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What Is a Greenhouse Effect and How Does It Work

A greenhouse (or hothouse) is intended to crop production, with a usually translucent outer shell of glass or plastic, which allows control of temperature, humidity and other environmental factors to encourage the growth of plants.
 In the former Spanish gardening, the greenhouse was called cold stove.
Seize the effect of solar radiation from the sun, passing through a glass or other translucent material, heats the objects inside; these, in turn, emit infrared radiation, with a length of greater than solar wave, thus cannot pass through the windows return to their getting caught and producing heating.
Emissions from the sun to the earth are shortwave land while abroad are in long wave.
The glass or plastic used for a greenhouse works as selective transmission medium for various spectral frequencies, and its effect is to trap energy within the greenhouse, which heats the indoor environment. Also it serves to prevent heat loss by convection. This can be demonstrated by opening a small window near the roof of a greenhouse: the temperature drops considerably. This principle is the basis of automatic cooling self-ventilation.
In the absence of a coating, the absorbed heat is eliminated by convection currents and the emission of infrared radiation (wavelength above the visible wavelength).

The presence of crystals or plastics prevents the transport of heat accumulated outward by convection and obstructs the exit of a portion of the infrared radiation. The net effect is the accumulation of heat and increase in temperature of the enclosure. View (technical) solar greenhouse for a more detailed discussion of technical work solar greenhouse.
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