What are wisps?
many legends have been tacking about a curious phenomenon and, at times overwhelming. Many people have noticed on the moors, swamps and cemeteries dim lights moving from side to side, and sometimes seem to follow even people. These lights are known as wisps. Many stories say that they are lost souls, or fairy lights and elves.
This look is actually caused by leakage of a gas called methane, which escapes from the soil and ignites on contact with air if the conditions of concentration, temperature and humidity permit.
This gas is produced by decomposing organic matter such as plants, dung and dead animals in shallow soil moisture. The decomposition is produced by bacteria that feed on these organic materials, and in the process produces methane gas.
The methane produced in this way normally escapes into the atmosphere gradually diluted and lost. However, under a layer of moist soil gas can be trapped, concentrating continuously. Eventually the accumulated gas is an escape to the surface.
Usually these are diluted exhaust gas in the air smoothly, but if the atmosphere is relatively calm can stay a while on earth. Sometimes, when mixed with oxygen gas is ignited, giving rise to these mysterious lights. Most are blue, but depending on the substances that form the gas can get yellowish, reddish or greenish. The temperature of this flame is too low, and indeed may not even managed to burn the grass around it can be. As it is a tenuous gas the least movement of air can shake the flame, which moves and can even ignite such gas leaks in the vicinity. In fact, if a person is near a Wisp and away from him, the air flow resulting from its movement can drag the flame in pursuit.
This is a typical phenomenon of land with weeds and high humidity environment, such as swamps, marshes and forests. Naturally, you can often in cemeteries by the gases produced by the bodies. However it can also occur on dry land, where the rain has created an underground band of moist soil. There is nothing mysterious, and are not dangerous.
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