In Abenteuerromanen und - filmen sterben immer wieder Menschen in gefährlichem Blowing sand, especially in the desert. In no time he swallowed mumble the defenseless victims and the persecutors with a shudder: "quicksand". Scientifically, the question is whether there is quicksand. Researchers have investigated this issue and have become in many ways find it ..
A variety of quicksand is found far away from all the deserts. It is a mixture of water and sand. Sand is quite loose stacked grains and thus not a very good resistance: On the beach it is hard to run out to build sand castles is so impossible. Only when water comes into play and fills the voids between the grains can be sand mud even behaving like a liquid. And at a certain water content is created quicksand. In this case, the sand entirely surrounded by water and have no contact anymore. The friction in the sand falls off, and thus its strength. This is still a "driving" force necessary, because otherwise the sand grains just fall to the ground, and above formed a puddle. That the sand remains in limbo, can keep on beaches, the tides flow. It can also be underground springs and earthquakes, which make possible such quicksand.
quicksand is not particularly dangerous. You sink, but never disappears completely. However, the more you fidget, the faster you sink in - because then it makes even sure that the sand grains remain in suspension.
Even if you are traveling in the desert. may have to deal with blowing sand. "Fechner Fechner" here means the dry quicksand. The sand grains are held by small clay granules at a distance and are therefore extremely loosely stacked. The volume of sand is increased so - researchers have measured that "Fechner Fechner" up to 15 to 30 percent consists of air. Those who enter this quicksand or car runs on bags, suddenly from ten to forty centimeters. Quite can drown in the "Fechner Fechner" no one, for it has not yet discovered any "Fechner Fechner layer", which was thicker than 1.20 meters.
(Source: Why do women freeze faster - Verlag CH Beck)
0 comments:
Post a Comment