Thunder
thunder|thunder
The thunder is a noise which is the consequence of an impact of Foudre during a Orage.
Origin
Épicure, at the third century before Jesus-Christ, tried to explain the formation by several assumptions of it: friction of clouds transformed into ice, condensation of fire or bearing of the breath inside the clouds. In the same way it puts forward the idea of a difference in transmission speed to explain the shift between the flash and the thunder. It does not exclude however not occurred the nonsimultaneous one from these two phenomena.At the time of a love at first sight, the Air on the level of the passage of the electric current is heated (30 000 °C) brutally; this sharp variation of the Température involves a Dilatation air and thus an abrupt expansion of this last. It is this phenomenon which generates the important noise of the thunder.
In practice
The thunder as makes it possible to determine the approximate distance from an impact, indeed the light moving more quickly as the its, the thunder does not appear at the same time as the flash. Of this fact it is possible to evaluate the approximate distance by counting the number of second which spaces a flash of its sound demonstration. It is then enough to multiply the number of second by the speed of sound (340 m/s) to obtain the distance. That amounts regarding the Speed of light (approximately 300.000.000 m/s) as infinite, acceptable approximation compared to the speed of sound.The Paratonnerre makes it possible to somewhat protect a masonry against the effects of the Foudre.
In mythologies
In different mythologies, the thunder was associated with a God:- Zeus, Greek Mythology
- Jupiter, Roman Mythology
- Thor, Scandinavian Mythology
- Ukko, Finnish Mythology
- Lei Gong, Chinese Mythology
- Raiden, Japanese Mythology
- Taranis, Celtic Mythology Gallic
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the deformed gods Héphaïstos in the Greek Mythology and Vulcan in the Roman Mythologie are also associated with the thunder and the lightning, in what they forged the lightnings of Zeus or Jupiter, according to one or the other of these mythologies.
See too
Related articles
External bonds
- Storms, thunder, the lightning, hails by [[Weather service of Canada] of Environnement Canada] the
- the thunder by [[Weather-France]]
- the storms by [[MétéoMédia]]
- the measurement of the lightning in flight with the project [[ILDAS]]
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