Tuesday, June 14, 2011

Macgregor Sand Mystery

Can suck people into the bottomless pit
Sand live is the most unique mechanism of the universe, he probably buried on the beach side of the river or maybe even in the backyard around him, calmly waiting for the people approached, making it difficult to advance or retreat. In 1692, at the port of Jamaica, ever live sand formed from soil solution by the quake, the latter causing 1 / 3 city lost, and the tragedy that killed 2,000 people. Lake looked calm in the south of England, a narrow fjord or bay the beautiful but dangerous Alaska and other areas of human events ever happen to fall into the sand of life. However, most people often have never come across the sand of life, let alone witnessed a person stuck in the sand of life or experience it for yourself. Impression of the people against the sand live mainly on the basis of various movies that saw. Atmosphere or the scenery which was created in the film depicts life of sand is a scourge that can suck people into the bottomless pit.

Would dissolve if the surface disturbed Quicksand
a scientist from the University of Amsterdam, the Netherlands namely Daniel Bonn ever meet a local shepherd. The pastor pointed to the sand and saying life in Bonn, that there had fallen into a camel and then he promptly disappeared berbekas.lalu not conduct an investigation relating to his country after kembai. He brought samples of sand to the Netherlands and to analyze their composition. Having found that the mixture consists of high-quality sand, clay, and salt water, Bonn and his team create artificial quicksand in large numbers.

He observed and carefully analyzed dozens of film that depicts a view of sand to swallow up human life, and found that the picture painted of these movies completely wrong and mistaken. Then, in the laboratory, Bonn mixing sand, clay and salt water, forming a sand model of living in a small room for examination. After repeated trials, personnel led the Bonn researchers have found, that it took several days to make the sand becomes sticky. Conversely very easy if you want to eliminate the viscosity (viscosity), which is fitting enough given the pressure on its surface. The surface will be "late" on the fly if you get a movement disorders, sand on the surface will become friable (soft), and sand in a shallow layer will also be dropped down rapidly. This displacement movement to make objects move on the surface of the sand sink to the bottom, then along with the increasing depth of immersion, the sand falling down through the displacement movement of the top layer will slowly merge, and will create a thick sediment, so that the viscosity or the nature glue accelerates sand, preventing the object plunged further.

Need the power of lifting a car
According to the research, that people who fall into the sands of life are generally not able to move, increasing the density of sand then glue on the lower limbs of life is mired in the sand, forming a very besas pressure on the body, making us very hard exertion. People who are very big strength is difficult even in a short time can remove victims trapped in the sands of life. After the relevant researchers calculated, that to remove one leg trapped victim with a speed of 1 cm / sec just need the strength of 100 thousand Newton, or roughly equivalent to the power of raising a medium size car. Unless aided by Derek cars, if not difficult to remove victims trapped in the sands of life are within a short time. Related research results also showed, according to the count of this power, if forcibly dragged the victim, before the sands of life "release" a trapped victim, the victim's body was broken attracted by the great power. Risks resulting from such actions is far more dangerous than allowing victims to stay alive in the sand for a while.

How to escape from the trap
Actually most of the sands of life are not much different from the sand in general, not creepy as depicted in the film. In principle, he just sand that has been impregnated water, because of friction (friction) between the grains of sand is reduced, so that a mixture of sand and water and half liquid that is difficult to support. Sand live normally found around the coast.

According to Benn, that there is only one state of sand live human can drown (drown), which is when the head first went in, but chances are mired in that way is very small. People who live mired in the sand just feel a little pressure on the chest, a bit difficult to breathe, would not life threatening. Tidal sand live near an enemy then a scary for victims who are trapped.

People mistakenly interpret that by shaking legs can loosen the sand around the body, thereby helping members to get out of the body in the sand. Related scientists said, the fact is not so, such movement will only accelerate the clay deposits, strengthening the viscosity (viscosity) of sand live, struggling blindly will only make the victims mired deeper.

Benn said, "how to escape from the sand of life still exists, namely victims who must move slowly trapped her legs, so that water and sand as much as seeping into the area empty, thus will be able to reduce the pressure of the victim's body, while making for slow sand menggembur-land. In addition, the victim must also try to separate limbs, because if the surface area of sand that touched the greater body, the buoyancy obtained will be even greater. Provided that the victim had patience enough, with enough movements calm and relaxed, then slowly certainly will be free from sand traps of life.

In addition, the research also found that, when an object is stuck in the sand of life, its setting speed is determined by the density of the object. Density of live sand is generally 2 g / milliliter, while the human density is 1g/milliliter. Under this density, the human body sank into the sands of life shall not drown, often going to stop until the waist.

In addition, researchers also found that although a number of objects larger than sand-density living, but still able to float on the sand of life. In a related experiment, they then put the ball aluminum 2.7g/mililiter density on the surface of quicksand. And even though its density is larger than life sand. But it gets the influence of buoyancy and tension quicksand sand, aluminum ball can still quietly located on the surface of live sand. The ball did not sink until the researchers vibrate the quicksand and made ​​a motion that causes the mixture more fluid. When doing this, an aluminum ball actually entirely submerged.

However, when using an aluminum ball has a density similar to humans, which means lower than the density of quicksand, the ball was never drowned, although the mixture is treated harshly. The fall of an object to cause pastikel quicksand sand mixed with water loss of stability. If business continues to receive pressure, the mixture will turn into more liquid on the surface and very solid at the bottom. "The greater the pressure, the more liquid the quicksand that is formed so that movement of the victim makes mired deeper and deeper," said Daniel Bonn, lead investigator from the University of Amsterdam, as written in the 29 September issue of Nature.

Based on the measurement of aluminum equipment, improving the physical pressure to the particles of a 1 percent led to the sinking velocity increased a million times. Bonn adding that pulling items out of the sand at this stage requires equal power lifting medium-sized car.

Patience and calm
"The most dangerous is when the sand suction tends to draw quickly," he said. But patience can save you. If you wait patiently, sand particles will eventually stabilize so that the mixture of buoyancy will lift you up.

We know that the sand layer beneath it over the meeting while more water in the upper layer. A very thick layer of sand beneath the water contains very little so it is difficult to remove leg slipped into it, "said Bonn. His advice, stay calm and usually you will float. Straighten your back to expand the area that is free and wait until the feet free of sand. Bonn is also suggested that the foot moves to control the water so you float. "You must enter the water into the sand and the easiest way is twirling around the foot in the quicksand," he added.
The recommendation is most likely correct. The proof, aluminum ball second in this experiment did not sink more than half. Although the ball is only four millimeters in diameter, density similar to humans and therefore can be used as a human model.