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Delicate stone bed
Physics | Delicate stone bed
Wooden stool very uncomfortable, because it so tough. But the wooden chair is quite comfortable and not at all hard. What is the reason for such a significant difference? In wicker hammock lie quite nicely. But the rope from which it is woven, very tough. Remember the old bed with a frame made of metal wire? No soft mattress, but it’s hard to find anything similar softer retro -bed. Is there a reason for explaining these contradictions? Gently lie and sit on hard! It’s small physical miracle. Why stone bed may seem softer softest of duvets?
Why a simple stool to sit rigidly, while in the chair, wooden, too, not at all tough? Why gently lay in a hammock, which is pretty solid rumors of rope? Why not lie firmly on the wire, arranged in beds instead of spring mattresses?
The reason for the post: flat seat stools and chairs in it concave. person contact with the stool only a small area. Area of contact with the chair some more. It follows from this that the chair puts pressure on the human body is less than the stool. Weight human distributed over a larger surface. So, per square centimeter of the surface has to smaller loads. Hence the pressure is reduced.
So, the whole thing here in more uniform distribution of pressure. When we nezhimsya in a soft bed, it formed recesses corresponding irregularities in our body. The pressure is distributed along the lower surface of the body are quite uniformly, so that each square centimeter have only a few grams. Not surprisingly, in these circumstances, we feel good.
The more evenly distributed pressure, the more comfortable. Upholstered sofa takes the form of the irregularities of the human body. As a result, per square centimeter have only a few grams of pressure. There is nothing strange that a man comfortable soft bed.
Thus, it is not in soft starting material. Even from a very hard starting material can build a very comfortable bed. Suppose that someone lay down on the soft clay, which took the form of the body of this man. The material is then left to dry. Indeed, the shrinkage during drying of the clay is from five to ten percent. Let’s start from the ideal conditions in which there is no shrinkage. It will take some time and the clay hardens, becoming solid. If the same person will fall into the groove left by his body, it will feel like on a feather bed.
Theoretically, if we assume that “B” will be hollowed out of stone, with a precise view of the irregularities is the man, this stone bed would be for him personally very gentle. Exactly as long as he does not want to move slightly, change the position of the hands or feet even a millimeter.
The larger the area, which relies on the human body, the softer it seems bed as one square centimeter grams of weight have less than this man. More pliable materials are tender because with incredible ease take shape. A person in a dream because of tossing and turning, changing position, such materials will be comfortable even after he rolled from side to side. A clay “bed” would have to sculpt and dry again. This feature of soft elastic material, easily changing shape, secured a dominant position in the production of beds, sofas and armchairs.
Thus, we were able to establish that the gentle stone bed is not a myth , and undeniable fact, confirmed by physical scientists.
On the grounds of “Entertaining Physics” Ya.I.Perelmana
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Tags: Education , Physics .
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